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:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.


QTRS
  ↳ DependencyPairsProof

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

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.

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

QUOT2(s1(x), s1(y)) -> QUOT2(minus2(x, y), s1(y))
PLUS2(s1(x), y) -> PLUS2(x, y)
SUM1(app2(l, cons2(x, cons2(y, k)))) -> APP2(l, sum1(cons2(x, cons2(y, k))))
SUM1(cons2(x, cons2(y, l))) -> PLUS2(x, y)
MINUS2(minus2(x, y), z) -> PLUS2(y, z)
SUM1(cons2(x, cons2(y, l))) -> SUM1(cons2(plus2(x, y), l))
SUM1(app2(l, cons2(x, cons2(y, k)))) -> SUM1(cons2(x, cons2(y, k)))
MINUS2(minus2(x, y), z) -> MINUS2(x, plus2(y, z))
MINUS2(s1(x), s1(y)) -> MINUS2(x, y)
QUOT2(s1(x), s1(y)) -> MINUS2(x, y)
SUM1(app2(l, cons2(x, cons2(y, k)))) -> SUM1(app2(l, sum1(cons2(x, cons2(y, k)))))
APP2(cons2(x, l), k) -> APP2(l, k)

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

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:

QUOT2(s1(x), s1(y)) -> QUOT2(minus2(x, y), s1(y))
PLUS2(s1(x), y) -> PLUS2(x, y)
SUM1(app2(l, cons2(x, cons2(y, k)))) -> APP2(l, sum1(cons2(x, cons2(y, k))))
SUM1(cons2(x, cons2(y, l))) -> PLUS2(x, y)
MINUS2(minus2(x, y), z) -> PLUS2(y, z)
SUM1(cons2(x, cons2(y, l))) -> SUM1(cons2(plus2(x, y), l))
SUM1(app2(l, cons2(x, cons2(y, k)))) -> SUM1(cons2(x, cons2(y, k)))
MINUS2(minus2(x, y), z) -> MINUS2(x, plus2(y, z))
MINUS2(s1(x), s1(y)) -> MINUS2(x, y)
QUOT2(s1(x), s1(y)) -> MINUS2(x, y)
SUM1(app2(l, cons2(x, cons2(y, k)))) -> SUM1(app2(l, sum1(cons2(x, cons2(y, k)))))
APP2(cons2(x, l), k) -> APP2(l, k)

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph contains 6 SCCs with 5 less nodes.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
QDP
            ↳ QDPAfsSolverProof
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP

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

APP2(cons2(x, l), k) -> APP2(l, k)

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using an argument filtering and a montonic ordering, at least one Dependency Pair of this SCC can be strictly oriented.

APP2(cons2(x, l), k) -> APP2(l, k)
Used argument filtering: APP2(x1, x2)  =  x1
cons2(x1, x2)  =  cons1(x2)
Used ordering: Quasi Precedence: trivial


↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
            ↳ QDPAfsSolverProof
QDP
                ↳ PisEmptyProof
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP

Q DP problem:
P is empty.
The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
QDP
            ↳ QDPAfsSolverProof
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP

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

PLUS2(s1(x), y) -> PLUS2(x, y)

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using an argument filtering and a montonic ordering, at least one Dependency Pair of this SCC can be strictly oriented.

PLUS2(s1(x), y) -> PLUS2(x, y)
Used argument filtering: PLUS2(x1, x2)  =  x1
s1(x1)  =  s1(x1)
Used ordering: Quasi Precedence: trivial


↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
            ↳ QDPAfsSolverProof
QDP
                ↳ PisEmptyProof
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP

Q DP problem:
P is empty.
The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
QDP
            ↳ QDPAfsSolverProof
          ↳ QDP
          ↳ QDP
          ↳ QDP

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

SUM1(cons2(x, cons2(y, l))) -> SUM1(cons2(plus2(x, y), l))

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using an argument filtering and a montonic ordering, at least one Dependency Pair of this SCC can be strictly oriented.

SUM1(cons2(x, cons2(y, l))) -> SUM1(cons2(plus2(x, y), l))
Used argument filtering: SUM1(x1)  =  x1
cons2(x1, x2)  =  cons1(x2)
plus2(x1, x2)  =  x2
0  =  0
s1(x1)  =  s
Used ordering: Quasi Precedence: cons_1 > s


↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
            ↳ QDPAfsSolverProof
QDP
                ↳ PisEmptyProof
          ↳ QDP
          ↳ QDP
          ↳ QDP

Q DP problem:
P is empty.
The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
QDP
          ↳ QDP
          ↳ QDP

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

SUM1(app2(l, cons2(x, cons2(y, k)))) -> SUM1(app2(l, sum1(cons2(x, cons2(y, k)))))

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

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

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
QDP
            ↳ QDPAfsSolverProof
          ↳ QDP

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

MINUS2(minus2(x, y), z) -> MINUS2(x, plus2(y, z))
MINUS2(s1(x), s1(y)) -> MINUS2(x, y)

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using an argument filtering and a montonic ordering, at least one Dependency Pair of this SCC can be strictly oriented.

MINUS2(minus2(x, y), z) -> MINUS2(x, plus2(y, z))
Used argument filtering: MINUS2(x1, x2)  =  x1
minus2(x1, x2)  =  minus1(x1)
s1(x1)  =  x1
plus2(x1, x2)  =  x2
0  =  0
Used ordering: Quasi Precedence: trivial


↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
            ↳ QDPAfsSolverProof
QDP
                ↳ QDPAfsSolverProof
          ↳ QDP

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

MINUS2(s1(x), s1(y)) -> MINUS2(x, y)

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using an argument filtering and a montonic ordering, at least one Dependency Pair of this SCC can be strictly oriented.

MINUS2(s1(x), s1(y)) -> MINUS2(x, y)
Used argument filtering: MINUS2(x1, x2)  =  x2
s1(x1)  =  s1(x1)
Used ordering: Quasi Precedence: trivial


↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
            ↳ QDPAfsSolverProof
              ↳ QDP
                ↳ QDPAfsSolverProof
QDP
                    ↳ PisEmptyProof
          ↳ QDP

Q DP problem:
P is empty.
The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
QDP
            ↳ QDPAfsSolverProof

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

QUOT2(s1(x), s1(y)) -> QUOT2(minus2(x, y), s1(y))

The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
By using an argument filtering and a montonic ordering, at least one Dependency Pair of this SCC can be strictly oriented.

QUOT2(s1(x), s1(y)) -> QUOT2(minus2(x, y), s1(y))
Used argument filtering: QUOT2(x1, x2)  =  x1
s1(x1)  =  s1(x1)
minus2(x1, x2)  =  x1
plus2(x1, x2)  =  plus2(x1, x2)
0  =  0
Used ordering: Quasi Precedence: plus_2 > s_1


↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ AND
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
          ↳ QDP
            ↳ QDPAfsSolverProof
QDP
                ↳ PisEmptyProof

Q DP problem:
P is empty.
The TRS R consists of the following rules:

minus2(x, 0) -> x
minus2(s1(x), s1(y)) -> minus2(x, y)
quot2(0, s1(y)) -> 0
quot2(s1(x), s1(y)) -> s1(quot2(minus2(x, y), s1(y)))
plus2(0, y) -> y
plus2(s1(x), y) -> s1(plus2(x, y))
minus2(minus2(x, y), z) -> minus2(x, plus2(y, z))
app2(nil, k) -> k
app2(l, nil) -> l
app2(cons2(x, l), k) -> cons2(x, app2(l, k))
sum1(cons2(x, nil)) -> cons2(x, nil)
sum1(cons2(x, cons2(y, l))) -> sum1(cons2(plus2(x, y), l))
sum1(app2(l, cons2(x, cons2(y, k)))) -> sum1(app2(l, sum1(cons2(x, cons2(y, k)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.