Termination w.r.t. Q proof of /tmp/tmpkv0rVX/ExSec4_2_DLMMU04

Termination w.r.t. Q of the following Term Rewriting System could not be shown:

Q restricted rewrite system:
The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

Q is empty.

↳ QTRS

  ↳ DependencyPairsProof

Q restricted rewrite system:
The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

Q is empty.

Using Dependency Pairs [1,15] we result in the following initial DP problem:
Q DP problem:
The TRS P consists of the following rules:

PROPER(u(X1, X2, X3, X4)) → PROPER(X2)
ACTIVE(natsFrom(N)) → NATSFROM(s(N))
PROPER(fst(X)) → FST(proper(X))
ACTIVE(fst(X)) → FST(active(X))
ACTIVE(take(X1, X2)) → TAKE(X1, active(X2))
ACTIVE(afterNth(N, XS)) → SND(splitAt(N, XS))
ACTIVE(cons(X1, X2)) → CONS(active(X1), X2)
AFTERNTH(X1, mark(X2)) → AFTERNTH(X1, X2)
ACTIVE(splitAt(0, XS)) → PAIR(nil, XS)
SEL(ok(X1), ok(X2)) → SEL(X1, X2)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X1)
PROPER(u(X1, X2, X3, X4)) → PROPER(X3)
ACTIVE(afterNth(N, XS)) → SPLITAT(N, XS)
FST(mark(X)) → FST(X)
ACTIVE(take(X1, X2)) → ACTIVE(X1)
SND(ok(X)) → SND(X)
ACTIVE(snd(X)) → ACTIVE(X)
ACTIVE(take(X1, X2)) → TAKE(active(X1), X2)
PROPER(sel(X1, X2)) → PROPER(X2)
SND(mark(X)) → SND(X)
PROPER(splitAt(X1, X2)) → SPLITAT(proper(X1), proper(X2))
ACTIVE(s(X)) → ACTIVE(X)
PROPER(natsFrom(X)) → NATSFROM(proper(X))
ACTIVE(tail(X)) → ACTIVE(X)
PROPER(fst(X)) → PROPER(X)
S(ok(X)) → S(X)
ACTIVE(take(N, XS)) → FST(splitAt(N, XS))
CONS(mark(X1), X2) → CONS(X1, X2)
ACTIVE(u(pair(YS, ZS), N, X, XS)) → CONS(X, YS)
ACTIVE(splitAt(s(N), cons(X, XS))) → U(splitAt(N, XS), N, X, XS)
TOP(mark(X)) → PROPER(X)
PAIR(mark(X1), X2) → PAIR(X1, X2)
ACTIVE(sel(X1, X2)) → ACTIVE(X2)
PROPER(u(X1, X2, X3, X4)) → U(proper(X1), proper(X2), proper(X3), proper(X4))
TOP(ok(X)) → ACTIVE(X)
SPLITAT(mark(X1), X2) → SPLITAT(X1, X2)
ACTIVE(sel(N, XS)) → HEAD(afterNth(N, XS))
U(mark(X1), X2, X3, X4) → U(X1, X2, X3, X4)
FST(ok(X)) → FST(X)
PROPER(cons(X1, X2)) → PROPER(X1)
AFTERNTH(ok(X1), ok(X2)) → AFTERNTH(X1, X2)
PROPER(tail(X)) → PROPER(X)
ACTIVE(fst(X)) → ACTIVE(X)
ACTIVE(afterNth(X1, X2)) → AFTERNTH(X1, active(X2))
PROPER(afterNth(X1, X2)) → PROPER(X1)
U(ok(X1), ok(X2), ok(X3), ok(X4)) → U(X1, X2, X3, X4)
S(mark(X)) → S(X)
ACTIVE(natsFrom(X)) → ACTIVE(X)
PROPER(cons(X1, X2)) → CONS(proper(X1), proper(X2))
ACTIVE(snd(X)) → SND(active(X))
PROPER(pair(X1, X2)) → PROPER(X1)
PROPER(head(X)) → HEAD(proper(X))
ACTIVE(afterNth(X1, X2)) → ACTIVE(X1)
ACTIVE(splitAt(s(N), cons(X, XS))) → SPLITAT(N, XS)
PROPER(natsFrom(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X1)
ACTIVE(u(X1, X2, X3, X4)) → U(active(X1), X2, X3, X4)
ACTIVE(head(X)) → ACTIVE(X)
ACTIVE(u(X1, X2, X3, X4)) → ACTIVE(X1)
ACTIVE(splitAt(X1, X2)) → SPLITAT(X1, active(X2))
ACTIVE(afterNth(X1, X2)) → AFTERNTH(active(X1), X2)
ACTIVE(sel(X1, X2)) → SEL(active(X1), X2)
ACTIVE(pair(X1, X2)) → ACTIVE(X1)
ACTIVE(take(N, XS)) → SPLITAT(N, XS)
ACTIVE(sel(X1, X2)) → ACTIVE(X1)
ACTIVE(splitAt(X1, X2)) → SPLITAT(active(X1), X2)
ACTIVE(pair(X1, X2)) → PAIR(X1, active(X2))
PROPER(afterNth(X1, X2)) → AFTERNTH(proper(X1), proper(X2))
PROPER(head(X)) → PROPER(X)
HEAD(mark(X)) → HEAD(X)
PROPER(snd(X)) → SND(proper(X))
PAIR(ok(X1), ok(X2)) → PAIR(X1, X2)
PROPER(cons(X1, X2)) → PROPER(X2)
ACTIVE(cons(X1, X2)) → ACTIVE(X1)
PROPER(u(X1, X2, X3, X4)) → PROPER(X4)
ACTIVE(u(pair(YS, ZS), N, X, XS)) → PAIR(cons(X, YS), ZS)
PROPER(sel(X1, X2)) → SEL(proper(X1), proper(X2))
AFTERNTH(mark(X1), X2) → AFTERNTH(X1, X2)
PROPER(s(X)) → S(proper(X))
PROPER(pair(X1, X2)) → PROPER(X2)
PROPER(tail(X)) → TAIL(proper(X))
NATSFROM(mark(X)) → NATSFROM(X)
TAIL(mark(X)) → TAIL(X)
ACTIVE(afterNth(X1, X2)) → ACTIVE(X2)
ACTIVE(sel(N, XS)) → AFTERNTH(N, XS)
ACTIVE(head(X)) → HEAD(active(X))
SPLITAT(ok(X1), ok(X2)) → SPLITAT(X1, X2)
TAKE(mark(X1), X2) → TAKE(X1, X2)
PROPER(snd(X)) → PROPER(X)
PAIR(X1, mark(X2)) → PAIR(X1, X2)
ACTIVE(natsFrom(N)) → S(N)
ACTIVE(pair(X1, X2)) → ACTIVE(X2)
SPLITAT(X1, mark(X2)) → SPLITAT(X1, X2)
SEL(mark(X1), X2) → SEL(X1, X2)
PROPER(take(X1, X2)) → TAKE(proper(X1), proper(X2))
ACTIVE(take(X1, X2)) → ACTIVE(X2)
NATSFROM(ok(X)) → NATSFROM(X)
PROPER(s(X)) → PROPER(X)
SEL(X1, mark(X2)) → SEL(X1, X2)
TAIL(ok(X)) → TAIL(X)
PROPER(take(X1, X2)) → PROPER(X2)
ACTIVE(pair(X1, X2)) → PAIR(active(X1), X2)
ACTIVE(tail(X)) → TAIL(active(X))
PROPER(afterNth(X1, X2)) → PROPER(X2)
TOP(ok(X)) → TOP(active(X))
TAKE(ok(X1), ok(X2)) → TAKE(X1, X2)
ACTIVE(sel(X1, X2)) → SEL(X1, active(X2))
PROPER(pair(X1, X2)) → PAIR(proper(X1), proper(X2))
CONS(ok(X1), ok(X2)) → CONS(X1, X2)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X2)
PROPER(splitAt(X1, X2)) → PROPER(X2)
ACTIVE(natsFrom(X)) → NATSFROM(active(X))
TAKE(X1, mark(X2)) → TAKE(X1, X2)
PROPER(take(X1, X2)) → PROPER(X1)
PROPER(splitAt(X1, X2)) → PROPER(X1)
PROPER(sel(X1, X2)) → PROPER(X1)
ACTIVE(natsFrom(N)) → CONS(N, natsFrom(s(N)))
TOP(mark(X)) → TOP(proper(X))
HEAD(ok(X)) → HEAD(X)
ACTIVE(s(X)) → S(active(X))

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

Q DP problem:
The TRS P consists of the following rules:

PROPER(u(X1, X2, X3, X4)) → PROPER(X2)
ACTIVE(natsFrom(N)) → NATSFROM(s(N))
PROPER(fst(X)) → FST(proper(X))
ACTIVE(fst(X)) → FST(active(X))
ACTIVE(take(X1, X2)) → TAKE(X1, active(X2))
ACTIVE(afterNth(N, XS)) → SND(splitAt(N, XS))
ACTIVE(cons(X1, X2)) → CONS(active(X1), X2)
AFTERNTH(X1, mark(X2)) → AFTERNTH(X1, X2)
ACTIVE(splitAt(0, XS)) → PAIR(nil, XS)
SEL(ok(X1), ok(X2)) → SEL(X1, X2)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X1)
PROPER(u(X1, X2, X3, X4)) → PROPER(X3)
ACTIVE(afterNth(N, XS)) → SPLITAT(N, XS)
FST(mark(X)) → FST(X)
ACTIVE(take(X1, X2)) → ACTIVE(X1)
SND(ok(X)) → SND(X)
ACTIVE(snd(X)) → ACTIVE(X)
ACTIVE(take(X1, X2)) → TAKE(active(X1), X2)
PROPER(sel(X1, X2)) → PROPER(X2)
SND(mark(X)) → SND(X)
PROPER(splitAt(X1, X2)) → SPLITAT(proper(X1), proper(X2))
ACTIVE(s(X)) → ACTIVE(X)
PROPER(natsFrom(X)) → NATSFROM(proper(X))
ACTIVE(tail(X)) → ACTIVE(X)
PROPER(fst(X)) → PROPER(X)
S(ok(X)) → S(X)
ACTIVE(take(N, XS)) → FST(splitAt(N, XS))
CONS(mark(X1), X2) → CONS(X1, X2)
ACTIVE(u(pair(YS, ZS), N, X, XS)) → CONS(X, YS)
ACTIVE(splitAt(s(N), cons(X, XS))) → U(splitAt(N, XS), N, X, XS)
TOP(mark(X)) → PROPER(X)
PAIR(mark(X1), X2) → PAIR(X1, X2)
ACTIVE(sel(X1, X2)) → ACTIVE(X2)
PROPER(u(X1, X2, X3, X4)) → U(proper(X1), proper(X2), proper(X3), proper(X4))
TOP(ok(X)) → ACTIVE(X)
SPLITAT(mark(X1), X2) → SPLITAT(X1, X2)
ACTIVE(sel(N, XS)) → HEAD(afterNth(N, XS))
U(mark(X1), X2, X3, X4) → U(X1, X2, X3, X4)
FST(ok(X)) → FST(X)
PROPER(cons(X1, X2)) → PROPER(X1)
AFTERNTH(ok(X1), ok(X2)) → AFTERNTH(X1, X2)
PROPER(tail(X)) → PROPER(X)
ACTIVE(fst(X)) → ACTIVE(X)
ACTIVE(afterNth(X1, X2)) → AFTERNTH(X1, active(X2))
PROPER(afterNth(X1, X2)) → PROPER(X1)
U(ok(X1), ok(X2), ok(X3), ok(X4)) → U(X1, X2, X3, X4)
S(mark(X)) → S(X)
ACTIVE(natsFrom(X)) → ACTIVE(X)
PROPER(cons(X1, X2)) → CONS(proper(X1), proper(X2))
ACTIVE(snd(X)) → SND(active(X))
PROPER(pair(X1, X2)) → PROPER(X1)
PROPER(head(X)) → HEAD(proper(X))
ACTIVE(afterNth(X1, X2)) → ACTIVE(X1)
ACTIVE(splitAt(s(N), cons(X, XS))) → SPLITAT(N, XS)
PROPER(natsFrom(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X1)
ACTIVE(u(X1, X2, X3, X4)) → U(active(X1), X2, X3, X4)
ACTIVE(head(X)) → ACTIVE(X)
ACTIVE(u(X1, X2, X3, X4)) → ACTIVE(X1)
ACTIVE(splitAt(X1, X2)) → SPLITAT(X1, active(X2))
ACTIVE(afterNth(X1, X2)) → AFTERNTH(active(X1), X2)
ACTIVE(sel(X1, X2)) → SEL(active(X1), X2)
ACTIVE(pair(X1, X2)) → ACTIVE(X1)
ACTIVE(take(N, XS)) → SPLITAT(N, XS)
ACTIVE(sel(X1, X2)) → ACTIVE(X1)
ACTIVE(splitAt(X1, X2)) → SPLITAT(active(X1), X2)
ACTIVE(pair(X1, X2)) → PAIR(X1, active(X2))
PROPER(afterNth(X1, X2)) → AFTERNTH(proper(X1), proper(X2))
PROPER(head(X)) → PROPER(X)
HEAD(mark(X)) → HEAD(X)
PROPER(snd(X)) → SND(proper(X))
PAIR(ok(X1), ok(X2)) → PAIR(X1, X2)
PROPER(cons(X1, X2)) → PROPER(X2)
ACTIVE(cons(X1, X2)) → ACTIVE(X1)
PROPER(u(X1, X2, X3, X4)) → PROPER(X4)
ACTIVE(u(pair(YS, ZS), N, X, XS)) → PAIR(cons(X, YS), ZS)
PROPER(sel(X1, X2)) → SEL(proper(X1), proper(X2))
AFTERNTH(mark(X1), X2) → AFTERNTH(X1, X2)
PROPER(s(X)) → S(proper(X))
PROPER(pair(X1, X2)) → PROPER(X2)
PROPER(tail(X)) → TAIL(proper(X))
NATSFROM(mark(X)) → NATSFROM(X)
TAIL(mark(X)) → TAIL(X)
ACTIVE(afterNth(X1, X2)) → ACTIVE(X2)
ACTIVE(sel(N, XS)) → AFTERNTH(N, XS)
ACTIVE(head(X)) → HEAD(active(X))
SPLITAT(ok(X1), ok(X2)) → SPLITAT(X1, X2)
TAKE(mark(X1), X2) → TAKE(X1, X2)
PROPER(snd(X)) → PROPER(X)
PAIR(X1, mark(X2)) → PAIR(X1, X2)
ACTIVE(natsFrom(N)) → S(N)
ACTIVE(pair(X1, X2)) → ACTIVE(X2)
SPLITAT(X1, mark(X2)) → SPLITAT(X1, X2)
SEL(mark(X1), X2) → SEL(X1, X2)
PROPER(take(X1, X2)) → TAKE(proper(X1), proper(X2))
ACTIVE(take(X1, X2)) → ACTIVE(X2)
NATSFROM(ok(X)) → NATSFROM(X)
PROPER(s(X)) → PROPER(X)
SEL(X1, mark(X2)) → SEL(X1, X2)
TAIL(ok(X)) → TAIL(X)
PROPER(take(X1, X2)) → PROPER(X2)
ACTIVE(pair(X1, X2)) → PAIR(active(X1), X2)
ACTIVE(tail(X)) → TAIL(active(X))
PROPER(afterNth(X1, X2)) → PROPER(X2)
TOP(ok(X)) → TOP(active(X))
TAKE(ok(X1), ok(X2)) → TAKE(X1, X2)
ACTIVE(sel(X1, X2)) → SEL(X1, active(X2))
PROPER(pair(X1, X2)) → PAIR(proper(X1), proper(X2))
CONS(ok(X1), ok(X2)) → CONS(X1, X2)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X2)
PROPER(splitAt(X1, X2)) → PROPER(X2)
ACTIVE(natsFrom(X)) → NATSFROM(active(X))
TAKE(X1, mark(X2)) → TAKE(X1, X2)
PROPER(take(X1, X2)) → PROPER(X1)
PROPER(splitAt(X1, X2)) → PROPER(X1)
PROPER(sel(X1, X2)) → PROPER(X1)
ACTIVE(natsFrom(N)) → CONS(N, natsFrom(s(N)))
TOP(mark(X)) → TOP(proper(X))
HEAD(ok(X)) → HEAD(X)
ACTIVE(s(X)) → S(active(X))

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph [15,17,22] contains 16 SCCs with 47 less nodes.

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

TAKE(ok(X1), ok(X2)) → TAKE(X1, X2)
TAKE(mark(X1), X2) → TAKE(X1, X2)
TAKE(X1, mark(X2)) → TAKE(X1, X2)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We can use the usable rules and reduction pair processor [15] with the Ce-compatible extension of the polynomial order that maps every function symbol to the sum of its argument. Then, we can delete all non-usable rules [17] from R.

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

TAKE(ok(X1), ok(X2)) → TAKE(X1, X2)
TAKE(mark(X1), X2) → TAKE(X1, X2)
TAKE(X1, mark(X2)) → TAKE(X1, X2)

R is empty.
Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using the subterm criterion [20] together with the size-change analysis [32] we have proven that there are no infinite chains for this DP problem.

From the DPs we obtained the following set of size-change graphs:

TAKE(ok(X1), ok(X2)) → TAKE(X1, X2)
The graph contains the following edges 1 > 1, 2 > 2
TAKE(mark(X1), X2) → TAKE(X1, X2)
The graph contains the following edges 1 > 1, 2 >= 2
TAKE(X1, mark(X2)) → TAKE(X1, X2)
The graph contains the following edges 1 >= 1, 2 > 2

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

AFTERNTH(ok(X1), ok(X2)) → AFTERNTH(X1, X2)
AFTERNTH(mark(X1), X2) → AFTERNTH(X1, X2)
AFTERNTH(X1, mark(X2)) → AFTERNTH(X1, X2)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

AFTERNTH(ok(X1), ok(X2)) → AFTERNTH(X1, X2)
AFTERNTH(mark(X1), X2) → AFTERNTH(X1, X2)
AFTERNTH(X1, mark(X2)) → AFTERNTH(X1, X2)

From the DPs we obtained the following set of size-change graphs:

AFTERNTH(ok(X1), ok(X2)) → AFTERNTH(X1, X2)
The graph contains the following edges 1 > 1, 2 > 2
AFTERNTH(mark(X1), X2) → AFTERNTH(X1, X2)
The graph contains the following edges 1 > 1, 2 >= 2
AFTERNTH(X1, mark(X2)) → AFTERNTH(X1, X2)
The graph contains the following edges 1 >= 1, 2 > 2

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

SEL(mark(X1), X2) → SEL(X1, X2)
SEL(ok(X1), ok(X2)) → SEL(X1, X2)
SEL(X1, mark(X2)) → SEL(X1, X2)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

SEL(mark(X1), X2) → SEL(X1, X2)
SEL(ok(X1), ok(X2)) → SEL(X1, X2)
SEL(X1, mark(X2)) → SEL(X1, X2)

From the DPs we obtained the following set of size-change graphs:

SEL(mark(X1), X2) → SEL(X1, X2)
The graph contains the following edges 1 > 1, 2 >= 2
SEL(ok(X1), ok(X2)) → SEL(X1, X2)
The graph contains the following edges 1 > 1, 2 > 2
SEL(X1, mark(X2)) → SEL(X1, X2)
The graph contains the following edges 1 >= 1, 2 > 2

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

TAIL(ok(X)) → TAIL(X)
TAIL(mark(X)) → TAIL(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

TAIL(ok(X)) → TAIL(X)
TAIL(mark(X)) → TAIL(X)

From the DPs we obtained the following set of size-change graphs:

TAIL(ok(X)) → TAIL(X)
The graph contains the following edges 1 > 1
TAIL(mark(X)) → TAIL(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

HEAD(mark(X)) → HEAD(X)
HEAD(ok(X)) → HEAD(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

HEAD(mark(X)) → HEAD(X)
HEAD(ok(X)) → HEAD(X)

From the DPs we obtained the following set of size-change graphs:

HEAD(mark(X)) → HEAD(X)
The graph contains the following edges 1 > 1
HEAD(ok(X)) → HEAD(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

U(mark(X1), X2, X3, X4) → U(X1, X2, X3, X4)
U(ok(X1), ok(X2), ok(X3), ok(X4)) → U(X1, X2, X3, X4)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

U(ok(X1), ok(X2), ok(X3), ok(X4)) → U(X1, X2, X3, X4)
U(mark(X1), X2, X3, X4) → U(X1, X2, X3, X4)

From the DPs we obtained the following set of size-change graphs:

U(mark(X1), X2, X3, X4) → U(X1, X2, X3, X4)
The graph contains the following edges 1 > 1, 2 >= 2, 3 >= 3, 4 >= 4
U(ok(X1), ok(X2), ok(X3), ok(X4)) → U(X1, X2, X3, X4)
The graph contains the following edges 1 > 1, 2 > 2, 3 > 3, 4 > 4

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

SPLITAT(X1, mark(X2)) → SPLITAT(X1, X2)
SPLITAT(mark(X1), X2) → SPLITAT(X1, X2)
SPLITAT(ok(X1), ok(X2)) → SPLITAT(X1, X2)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

SPLITAT(X1, mark(X2)) → SPLITAT(X1, X2)
SPLITAT(mark(X1), X2) → SPLITAT(X1, X2)
SPLITAT(ok(X1), ok(X2)) → SPLITAT(X1, X2)

From the DPs we obtained the following set of size-change graphs:

SPLITAT(X1, mark(X2)) → SPLITAT(X1, X2)
The graph contains the following edges 1 >= 1, 2 > 2
SPLITAT(mark(X1), X2) → SPLITAT(X1, X2)
The graph contains the following edges 1 > 1, 2 >= 2
SPLITAT(ok(X1), ok(X2)) → SPLITAT(X1, X2)
The graph contains the following edges 1 > 1, 2 > 2

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

SND(mark(X)) → SND(X)
SND(ok(X)) → SND(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

SND(mark(X)) → SND(X)
SND(ok(X)) → SND(X)

From the DPs we obtained the following set of size-change graphs:

SND(mark(X)) → SND(X)
The graph contains the following edges 1 > 1
SND(ok(X)) → SND(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

PAIR(ok(X1), ok(X2)) → PAIR(X1, X2)
PAIR(mark(X1), X2) → PAIR(X1, X2)
PAIR(X1, mark(X2)) → PAIR(X1, X2)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

PAIR(ok(X1), ok(X2)) → PAIR(X1, X2)
PAIR(mark(X1), X2) → PAIR(X1, X2)
PAIR(X1, mark(X2)) → PAIR(X1, X2)

From the DPs we obtained the following set of size-change graphs:

PAIR(ok(X1), ok(X2)) → PAIR(X1, X2)
The graph contains the following edges 1 > 1, 2 > 2
PAIR(mark(X1), X2) → PAIR(X1, X2)
The graph contains the following edges 1 > 1, 2 >= 2
PAIR(X1, mark(X2)) → PAIR(X1, X2)
The graph contains the following edges 1 >= 1, 2 > 2

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

FST(ok(X)) → FST(X)
FST(mark(X)) → FST(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

FST(ok(X)) → FST(X)
FST(mark(X)) → FST(X)

From the DPs we obtained the following set of size-change graphs:

FST(ok(X)) → FST(X)
The graph contains the following edges 1 > 1
FST(mark(X)) → FST(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

S(ok(X)) → S(X)
S(mark(X)) → S(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

S(ok(X)) → S(X)
S(mark(X)) → S(X)

From the DPs we obtained the following set of size-change graphs:

S(ok(X)) → S(X)
The graph contains the following edges 1 > 1
S(mark(X)) → S(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

CONS(mark(X1), X2) → CONS(X1, X2)
CONS(ok(X1), ok(X2)) → CONS(X1, X2)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

CONS(mark(X1), X2) → CONS(X1, X2)
CONS(ok(X1), ok(X2)) → CONS(X1, X2)

From the DPs we obtained the following set of size-change graphs:

CONS(mark(X1), X2) → CONS(X1, X2)
The graph contains the following edges 1 > 1, 2 >= 2
CONS(ok(X1), ok(X2)) → CONS(X1, X2)
The graph contains the following edges 1 > 1, 2 > 2

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

NATSFROM(ok(X)) → NATSFROM(X)
NATSFROM(mark(X)) → NATSFROM(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

NATSFROM(ok(X)) → NATSFROM(X)
NATSFROM(mark(X)) → NATSFROM(X)

From the DPs we obtained the following set of size-change graphs:

NATSFROM(ok(X)) → NATSFROM(X)
The graph contains the following edges 1 > 1
NATSFROM(mark(X)) → NATSFROM(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

PROPER(u(X1, X2, X3, X4)) → PROPER(X2)
PROPER(sel(X1, X2)) → PROPER(X2)
PROPER(pair(X1, X2)) → PROPER(X1)
PROPER(splitAt(X1, X2)) → PROPER(X2)
PROPER(pair(X1, X2)) → PROPER(X2)
PROPER(head(X)) → PROPER(X)
PROPER(natsFrom(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X1)
PROPER(take(X1, X2)) → PROPER(X1)
PROPER(cons(X1, X2)) → PROPER(X1)
PROPER(s(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X3)
PROPER(sel(X1, X2)) → PROPER(X1)
PROPER(tail(X)) → PROPER(X)
PROPER(splitAt(X1, X2)) → PROPER(X1)
PROPER(take(X1, X2)) → PROPER(X2)
PROPER(cons(X1, X2)) → PROPER(X2)
PROPER(snd(X)) → PROPER(X)
PROPER(afterNth(X1, X2)) → PROPER(X1)
PROPER(afterNth(X1, X2)) → PROPER(X2)
PROPER(fst(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X4)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

PROPER(u(X1, X2, X3, X4)) → PROPER(X2)
PROPER(sel(X1, X2)) → PROPER(X2)
PROPER(pair(X1, X2)) → PROPER(X1)
PROPER(splitAt(X1, X2)) → PROPER(X2)
PROPER(pair(X1, X2)) → PROPER(X2)
PROPER(head(X)) → PROPER(X)
PROPER(natsFrom(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X1)
PROPER(take(X1, X2)) → PROPER(X1)
PROPER(cons(X1, X2)) → PROPER(X1)
PROPER(s(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X3)
PROPER(splitAt(X1, X2)) → PROPER(X1)
PROPER(tail(X)) → PROPER(X)
PROPER(sel(X1, X2)) → PROPER(X1)
PROPER(cons(X1, X2)) → PROPER(X2)
PROPER(take(X1, X2)) → PROPER(X2)
PROPER(snd(X)) → PROPER(X)
PROPER(afterNth(X1, X2)) → PROPER(X1)
PROPER(afterNth(X1, X2)) → PROPER(X2)
PROPER(fst(X)) → PROPER(X)
PROPER(u(X1, X2, X3, X4)) → PROPER(X4)

From the DPs we obtained the following set of size-change graphs:

PROPER(u(X1, X2, X3, X4)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(sel(X1, X2)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(pair(X1, X2)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(splitAt(X1, X2)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(pair(X1, X2)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(head(X)) → PROPER(X)
The graph contains the following edges 1 > 1
PROPER(natsFrom(X)) → PROPER(X)
The graph contains the following edges 1 > 1
PROPER(u(X1, X2, X3, X4)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(take(X1, X2)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(cons(X1, X2)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(s(X)) → PROPER(X)
The graph contains the following edges 1 > 1
PROPER(u(X1, X2, X3, X4)) → PROPER(X3)
The graph contains the following edges 1 > 1
PROPER(sel(X1, X2)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(tail(X)) → PROPER(X)
The graph contains the following edges 1 > 1
PROPER(splitAt(X1, X2)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(take(X1, X2)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(cons(X1, X2)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(snd(X)) → PROPER(X)
The graph contains the following edges 1 > 1
PROPER(afterNth(X1, X2)) → PROPER(X1)
The graph contains the following edges 1 > 1
PROPER(afterNth(X1, X2)) → PROPER(X2)
The graph contains the following edges 1 > 1
PROPER(fst(X)) → PROPER(X)
The graph contains the following edges 1 > 1
PROPER(u(X1, X2, X3, X4)) → PROPER(X4)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

ACTIVE(pair(X1, X2)) → ACTIVE(X2)
ACTIVE(snd(X)) → ACTIVE(X)
ACTIVE(pair(X1, X2)) → ACTIVE(X1)
ACTIVE(natsFrom(X)) → ACTIVE(X)
ACTIVE(take(X1, X2)) → ACTIVE(X2)
ACTIVE(sel(X1, X2)) → ACTIVE(X1)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X2)
ACTIVE(afterNth(X1, X2)) → ACTIVE(X1)
ACTIVE(sel(X1, X2)) → ACTIVE(X2)
ACTIVE(afterNth(X1, X2)) → ACTIVE(X2)
ACTIVE(s(X)) → ACTIVE(X)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X1)
ACTIVE(fst(X)) → ACTIVE(X)
ACTIVE(head(X)) → ACTIVE(X)
ACTIVE(cons(X1, X2)) → ACTIVE(X1)
ACTIVE(u(X1, X2, X3, X4)) → ACTIVE(X1)
ACTIVE(take(X1, X2)) → ACTIVE(X1)
ACTIVE(tail(X)) → ACTIVE(X)

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesProof

              ↳ QDP

                ↳ QDPSizeChangeProof

          ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

ACTIVE(pair(X1, X2)) → ACTIVE(X2)
ACTIVE(snd(X)) → ACTIVE(X)
ACTIVE(pair(X1, X2)) → ACTIVE(X1)
ACTIVE(natsFrom(X)) → ACTIVE(X)
ACTIVE(take(X1, X2)) → ACTIVE(X2)
ACTIVE(sel(X1, X2)) → ACTIVE(X1)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X2)
ACTIVE(afterNth(X1, X2)) → ACTIVE(X1)
ACTIVE(sel(X1, X2)) → ACTIVE(X2)
ACTIVE(afterNth(X1, X2)) → ACTIVE(X2)
ACTIVE(s(X)) → ACTIVE(X)
ACTIVE(splitAt(X1, X2)) → ACTIVE(X1)
ACTIVE(head(X)) → ACTIVE(X)
ACTIVE(fst(X)) → ACTIVE(X)
ACTIVE(u(X1, X2, X3, X4)) → ACTIVE(X1)
ACTIVE(cons(X1, X2)) → ACTIVE(X1)
ACTIVE(tail(X)) → ACTIVE(X)
ACTIVE(take(X1, X2)) → ACTIVE(X1)

From the DPs we obtained the following set of size-change graphs:

ACTIVE(pair(X1, X2)) → ACTIVE(X2)
The graph contains the following edges 1 > 1
ACTIVE(snd(X)) → ACTIVE(X)
The graph contains the following edges 1 > 1
ACTIVE(pair(X1, X2)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(natsFrom(X)) → ACTIVE(X)
The graph contains the following edges 1 > 1
ACTIVE(take(X1, X2)) → ACTIVE(X2)
The graph contains the following edges 1 > 1
ACTIVE(sel(X1, X2)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(splitAt(X1, X2)) → ACTIVE(X2)
The graph contains the following edges 1 > 1
ACTIVE(afterNth(X1, X2)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(sel(X1, X2)) → ACTIVE(X2)
The graph contains the following edges 1 > 1
ACTIVE(afterNth(X1, X2)) → ACTIVE(X2)
The graph contains the following edges 1 > 1
ACTIVE(s(X)) → ACTIVE(X)
The graph contains the following edges 1 > 1
ACTIVE(splitAt(X1, X2)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(fst(X)) → ACTIVE(X)
The graph contains the following edges 1 > 1
ACTIVE(head(X)) → ACTIVE(X)
The graph contains the following edges 1 > 1
ACTIVE(cons(X1, X2)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(u(X1, X2, X3, X4)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(take(X1, X2)) → ACTIVE(X1)
The graph contains the following edges 1 > 1
ACTIVE(tail(X)) → ACTIVE(X)
The graph contains the following edges 1 > 1

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

Q DP problem:
The TRS P consists of the following rules:

TOP(mark(X)) → TOP(proper(X))
TOP(ok(X)) → TOP(active(X))

The TRS R consists of the following rules:

active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))
natsFrom(mark(X)) → mark(natsFrom(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
s(mark(X)) → mark(s(X))
fst(mark(X)) → mark(fst(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
snd(mark(X)) → mark(snd(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
head(mark(X)) → mark(head(X))
tail(mark(X)) → mark(tail(X))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
natsFrom(ok(X)) → ok(natsFrom(X))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
s(ok(X)) → ok(s(X))
fst(ok(X)) → ok(fst(X))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
snd(ok(X)) → ok(snd(X))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
head(ok(X)) → ok(head(X))
tail(ok(X)) → ok(tail(X))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
top(mark(X)) → top(proper(X))
top(ok(X)) → top(active(X))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using the usable rules with reduction pair processor [15] with a polynomial ordering [25], all dependency pairs and the corresponding usable rules [17] can be oriented non-strictly. All non-usable rules are removed, and those dependency pairs and usable rules that have been oriented strictly or contain non-usable symbols in their left-hand side are removed as well.

No dependency pairs are removed.

No rules are removed from R.

Used ordering: POLO with Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = 2·x₁
POL(afterNth(x₁, x₂)) = 2·x₁ + 2·x₂
POL(cons(x₁, x₂)) = 2·x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = 2·x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = 2·x₁
POL(nil) = 0
POL(ok(x₁)) = 2·x₁
POL(pair(x₁, x₂)) = 2·x₁ + 2·x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = x₁
POL(sel(x₁, x₂)) = 2·x₁ + 2·x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₁ + x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = 2·x₁ + x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₂ + 2·x₃ + x₄

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

Q DP problem:
The TRS P consists of the following rules:

TOP(mark(X)) → TOP(proper(X))
TOP(ok(X)) → TOP(active(X))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By narrowing [15] the rule TOP(mark(X)) → TOP(proper(X)) at position [0] we obtained the following new rules:

TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(mark(0)) → TOP(ok(0))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(mark(nil)) → TOP(ok(nil))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

Q DP problem:
The TRS P consists of the following rules:

TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(mark(0)) → TOP(ok(0))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(nil)) → TOP(ok(nil))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(X)) → TOP(active(X))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By narrowing [15] the rule TOP(ok(X)) → TOP(active(X)) at position [0] we obtained the following new rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(fst(pair(x0, x1)))) → TOP(mark(x0))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(mark(head(afterNth(x0, x1))))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(nil)) → TOP(ok(nil))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(fst(pair(x0, x1)))) → TOP(mark(x0))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(sel(x0, x1))) → TOP(mark(head(afterNth(x0, x1))))
TOP(mark(0)) → TOP(ok(0))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph [15,17,22] contains 1 SCC with 2 less nodes.

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(fst(pair(x0, x1)))) → TOP(mark(x0))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(sel(x0, x1))) → TOP(mark(head(afterNth(x0, x1))))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(sel(x0, x1))) → TOP(mark(head(afterNth(x0, x1))))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(fst(pair(x0, x1)))) → TOP(mark(x0))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 1 + x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(fst(pair(x0, x1)))) → TOP(mark(x0))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(fst(pair(x0, x1)))) → TOP(mark(x0))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = 1 + x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = 1 + x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(tail(cons(x0, x1)))) → TOP(mark(x1))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = 1 + x₁
POL(take(x₁, x₂)) = x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(take(x0, x1))) → TOP(mark(fst(splitAt(x0, x1))))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = 1 + x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(afterNth(x0, x1))) → TOP(mark(snd(splitAt(x0, x1))))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = 1 + x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 1 + x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(splitAt(0, x0))) → TOP(mark(pair(nil, x0)))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = 1 + x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 1 + x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = 1 + x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = 1 + x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

                                                  ↳ QDP

                                                    ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(head(cons(x0, x1)))) → TOP(mark(x0))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = 1 + x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 1 + x₂
POL(snd(x₁)) = x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

                                                  ↳ QDP

                                                    ↳ QDPOrderProof

                                                      ↳ QDP

                                                        ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(snd(pair(x0, x1)))) → TOP(mark(x1))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = x₁
POL(afterNth(x₁, x₂)) = 1 + x₂
POL(cons(x₁, x₂)) = x₁ + x₂
POL(fst(x₁)) = x₁
POL(head(x₁)) = x₁
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = x₁
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = x₁ + x₂
POL(proper(x₁)) = x₁
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 1 + x₂
POL(snd(x₁)) = 1 + x₁
POL(splitAt(x₁, x₂)) = x₂
POL(tail(x₁)) = x₁
POL(take(x₁, x₂)) = x₂
POL(u(x₁, x₂, x₃, x₄)) = x₁ + x₃

The following usable rules [17] were oriented:

proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
active(take(X1, X2)) → take(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(fst(X)) → fst(active(X))
active(s(X)) → s(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(natsFrom(X)) → natsFrom(active(X))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(tail(cons(N, XS))) → mark(XS)
active(head(cons(N, XS))) → mark(N)
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(snd(pair(XS, YS))) → mark(YS)
active(fst(pair(XS, YS))) → mark(XS)
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

                                                  ↳ QDP

                                                    ↳ QDPOrderProof

                                                      ↳ QDP

                                                        ↳ QDPOrderProof

                                                          ↳ QDP

                                                            ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(splitAt(s(x0), cons(x1, x2)))) → TOP(mark(u(splitAt(x0, x2), x0, x1, x2)))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = 0
POL(afterNth(x₁, x₂)) = 0
POL(cons(x₁, x₂)) = 0
POL(fst(x₁)) = 0
POL(head(x₁)) = 0
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = 0
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = 0
POL(proper(x₁)) = 0
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 0
POL(snd(x₁)) = 0
POL(splitAt(x₁, x₂)) = 1
POL(tail(x₁)) = 0
POL(take(x₁, x₂)) = 0
POL(u(x₁, x₂, x₃, x₄)) = 0

The following usable rules [17] were oriented:

fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

                                                  ↳ QDP

                                                    ↳ QDPOrderProof

                                                      ↳ QDP

                                                        ↳ QDPOrderProof

                                                          ↳ QDP

                                                            ↳ QDPOrderProof

                                                              ↳ QDP

                                                                ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(natsFrom(x0))) → TOP(mark(cons(x0, natsFrom(s(x0)))))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = 0
POL(afterNth(x₁, x₂)) = 0
POL(cons(x₁, x₂)) = 0
POL(fst(x₁)) = 0
POL(head(x₁)) = 0
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = 1
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = 0
POL(proper(x₁)) = 0
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 0
POL(snd(x₁)) = 0
POL(splitAt(x₁, x₂)) = 0
POL(tail(x₁)) = 0
POL(take(x₁, x₂)) = 0
POL(u(x₁, x₂, x₃, x₄)) = 0

The following usable rules [17] were oriented:

fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

                                                  ↳ QDP

                                                    ↳ QDPOrderProof

                                                      ↳ QDP

                                                        ↳ QDPOrderProof

                                                          ↳ QDP

                                                            ↳ QDPOrderProof

                                                              ↳ QDP

                                                                ↳ QDPOrderProof

                                                                  ↳ QDP

                                                                    ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [15].

The following pairs can be oriented strictly and are deleted.

TOP(ok(u(pair(x0, x1), x2, x3, x4))) → TOP(mark(pair(cons(x3, x0), x1)))

The remaining pairs can at least be oriented weakly.

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))

Used ordering: Polynomial interpretation [25]:

POL(0) = 0
POL(TOP(x₁)) = x₁
POL(active(x₁)) = 0
POL(afterNth(x₁, x₂)) = 0
POL(cons(x₁, x₂)) = 0
POL(fst(x₁)) = 0
POL(head(x₁)) = 0
POL(mark(x₁)) = x₁
POL(natsFrom(x₁)) = 0
POL(nil) = 0
POL(ok(x₁)) = x₁
POL(pair(x₁, x₂)) = 0
POL(proper(x₁)) = 0
POL(s(x₁)) = 0
POL(sel(x₁, x₂)) = 0
POL(snd(x₁)) = 0
POL(splitAt(x₁, x₂)) = 0
POL(tail(x₁)) = 0
POL(take(x₁, x₂)) = 0
POL(u(x₁, x₂, x₃, x₄)) = 1

The following usable rules [17] were oriented:

fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
tail(ok(X)) → ok(tail(X))
tail(mark(X)) → mark(tail(X))
head(ok(X)) → ok(head(X))
head(mark(X)) → mark(head(X))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
take(mark(X1), X2) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))

↳ QTRS

  ↳ DependencyPairsProof

    ↳ QDP

      ↳ DependencyGraphProof

        ↳ AND

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

          ↳ QDP

            ↳ UsableRulesReductionPairsProof

              ↳ QDP

                ↳ Narrowing

                  ↳ QDP

                    ↳ Narrowing

                      ↳ QDP

                        ↳ DependencyGraphProof

                          ↳ QDP

                            ↳ QDPOrderProof

                              ↳ QDP

                                ↳ QDPOrderProof

                                  ↳ QDP

                                    ↳ QDPOrderProof

                                      ↳ QDP

                                        ↳ QDPOrderProof

                                          ↳ QDP

                                            ↳ QDPOrderProof

                                              ↳ QDP

                                                ↳ QDPOrderProof

                                                  ↳ QDP

                                                    ↳ QDPOrderProof

                                                      ↳ QDP

                                                        ↳ QDPOrderProof

                                                          ↳ QDP

                                                            ↳ QDPOrderProof

                                                              ↳ QDP

                                                                ↳ QDPOrderProof

                                                                  ↳ QDP

                                                                    ↳ QDPOrderProof

                                                                      ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

TOP(ok(splitAt(x0, x1))) → TOP(splitAt(active(x0), x1))
TOP(ok(u(x0, x1, x2, x3))) → TOP(u(active(x0), x1, x2, x3))
TOP(mark(afterNth(x0, x1))) → TOP(afterNth(proper(x0), proper(x1)))
TOP(ok(fst(x0))) → TOP(fst(active(x0)))
TOP(ok(natsFrom(x0))) → TOP(natsFrom(active(x0)))
TOP(mark(tail(x0))) → TOP(tail(proper(x0)))
TOP(mark(snd(x0))) → TOP(snd(proper(x0)))
TOP(mark(head(x0))) → TOP(head(proper(x0)))
TOP(ok(take(x0, x1))) → TOP(take(x0, active(x1)))
TOP(mark(fst(x0))) → TOP(fst(proper(x0)))
TOP(mark(u(x0, x1, x2, x3))) → TOP(u(proper(x0), proper(x1), proper(x2), proper(x3)))
TOP(ok(cons(x0, x1))) → TOP(cons(active(x0), x1))
TOP(ok(head(x0))) → TOP(head(active(x0)))
TOP(mark(pair(x0, x1))) → TOP(pair(proper(x0), proper(x1)))
TOP(ok(take(x0, x1))) → TOP(take(active(x0), x1))
TOP(ok(sel(x0, x1))) → TOP(sel(x0, active(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(active(x0), x1))
TOP(ok(snd(x0))) → TOP(snd(active(x0)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(x0, active(x1)))
TOP(mark(s(x0))) → TOP(s(proper(x0)))
TOP(mark(splitAt(x0, x1))) → TOP(splitAt(proper(x0), proper(x1)))
TOP(ok(s(x0))) → TOP(s(active(x0)))
TOP(ok(sel(x0, x1))) → TOP(sel(active(x0), x1))
TOP(mark(sel(x0, x1))) → TOP(sel(proper(x0), proper(x1)))
TOP(ok(splitAt(x0, x1))) → TOP(splitAt(x0, active(x1)))
TOP(mark(natsFrom(x0))) → TOP(natsFrom(proper(x0)))
TOP(mark(cons(x0, x1))) → TOP(cons(proper(x0), proper(x1)))
TOP(ok(afterNth(x0, x1))) → TOP(afterNth(active(x0), x1))
TOP(mark(take(x0, x1))) → TOP(take(proper(x0), proper(x1)))
TOP(ok(pair(x0, x1))) → TOP(pair(x0, active(x1)))
TOP(ok(tail(x0))) → TOP(tail(active(x0)))

The TRS R consists of the following rules:

proper(natsFrom(X)) → natsFrom(proper(X))
proper(cons(X1, X2)) → cons(proper(X1), proper(X2))
proper(s(X)) → s(proper(X))
proper(fst(X)) → fst(proper(X))
proper(pair(X1, X2)) → pair(proper(X1), proper(X2))
proper(snd(X)) → snd(proper(X))
proper(splitAt(X1, X2)) → splitAt(proper(X1), proper(X2))
proper(0) → ok(0)
proper(nil) → ok(nil)
proper(u(X1, X2, X3, X4)) → u(proper(X1), proper(X2), proper(X3), proper(X4))
proper(head(X)) → head(proper(X))
proper(tail(X)) → tail(proper(X))
proper(sel(X1, X2)) → sel(proper(X1), proper(X2))
proper(afterNth(X1, X2)) → afterNth(proper(X1), proper(X2))
proper(take(X1, X2)) → take(proper(X1), proper(X2))
take(mark(X1), X2) → mark(take(X1, X2))
take(X1, mark(X2)) → mark(take(X1, X2))
take(ok(X1), ok(X2)) → ok(take(X1, X2))
afterNth(mark(X1), X2) → mark(afterNth(X1, X2))
afterNth(X1, mark(X2)) → mark(afterNth(X1, X2))
afterNth(ok(X1), ok(X2)) → ok(afterNth(X1, X2))
sel(mark(X1), X2) → mark(sel(X1, X2))
sel(X1, mark(X2)) → mark(sel(X1, X2))
sel(ok(X1), ok(X2)) → ok(sel(X1, X2))
tail(mark(X)) → mark(tail(X))
tail(ok(X)) → ok(tail(X))
head(mark(X)) → mark(head(X))
head(ok(X)) → ok(head(X))
u(mark(X1), X2, X3, X4) → mark(u(X1, X2, X3, X4))
u(ok(X1), ok(X2), ok(X3), ok(X4)) → ok(u(X1, X2, X3, X4))
splitAt(mark(X1), X2) → mark(splitAt(X1, X2))
splitAt(X1, mark(X2)) → mark(splitAt(X1, X2))
splitAt(ok(X1), ok(X2)) → ok(splitAt(X1, X2))
snd(mark(X)) → mark(snd(X))
snd(ok(X)) → ok(snd(X))
pair(mark(X1), X2) → mark(pair(X1, X2))
pair(X1, mark(X2)) → mark(pair(X1, X2))
pair(ok(X1), ok(X2)) → ok(pair(X1, X2))
fst(mark(X)) → mark(fst(X))
fst(ok(X)) → ok(fst(X))
s(mark(X)) → mark(s(X))
s(ok(X)) → ok(s(X))
cons(mark(X1), X2) → mark(cons(X1, X2))
cons(ok(X1), ok(X2)) → ok(cons(X1, X2))
natsFrom(mark(X)) → mark(natsFrom(X))
natsFrom(ok(X)) → ok(natsFrom(X))
active(natsFrom(N)) → mark(cons(N, natsFrom(s(N))))
active(fst(pair(XS, YS))) → mark(XS)
active(snd(pair(XS, YS))) → mark(YS)
active(splitAt(0, XS)) → mark(pair(nil, XS))
active(splitAt(s(N), cons(X, XS))) → mark(u(splitAt(N, XS), N, X, XS))
active(u(pair(YS, ZS), N, X, XS)) → mark(pair(cons(X, YS), ZS))
active(head(cons(N, XS))) → mark(N)
active(tail(cons(N, XS))) → mark(XS)
active(sel(N, XS)) → mark(head(afterNth(N, XS)))
active(take(N, XS)) → mark(fst(splitAt(N, XS)))
active(afterNth(N, XS)) → mark(snd(splitAt(N, XS)))
active(natsFrom(X)) → natsFrom(active(X))
active(cons(X1, X2)) → cons(active(X1), X2)
active(s(X)) → s(active(X))
active(fst(X)) → fst(active(X))
active(pair(X1, X2)) → pair(active(X1), X2)
active(pair(X1, X2)) → pair(X1, active(X2))
active(snd(X)) → snd(active(X))
active(splitAt(X1, X2)) → splitAt(active(X1), X2)
active(splitAt(X1, X2)) → splitAt(X1, active(X2))
active(u(X1, X2, X3, X4)) → u(active(X1), X2, X3, X4)
active(head(X)) → head(active(X))
active(tail(X)) → tail(active(X))
active(sel(X1, X2)) → sel(active(X1), X2)
active(sel(X1, X2)) → sel(X1, active(X2))
active(afterNth(X1, X2)) → afterNth(active(X1), X2)
active(afterNth(X1, X2)) → afterNth(X1, active(X2))
active(take(X1, X2)) → take(active(X1), X2)
active(take(X1, X2)) → take(X1, active(X2))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.