Problem:
 active(zeros()) -> mark(cons(0(),zeros()))
 active(U11(tt(),L)) -> mark(U12(tt(),L))
 active(U12(tt(),L)) -> mark(s(length(L)))
 active(length(nil())) -> mark(0())
 active(length(cons(N,L))) -> mark(U11(tt(),L))
 active(cons(X1,X2)) -> cons(active(X1),X2)
 active(U11(X1,X2)) -> U11(active(X1),X2)
 active(U12(X1,X2)) -> U12(active(X1),X2)
 active(s(X)) -> s(active(X))
 active(length(X)) -> length(active(X))
 cons(mark(X1),X2) -> mark(cons(X1,X2))
 U11(mark(X1),X2) -> mark(U11(X1,X2))
 U12(mark(X1),X2) -> mark(U12(X1,X2))
 s(mark(X)) -> mark(s(X))
 length(mark(X)) -> mark(length(X))
 proper(zeros()) -> ok(zeros())
 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2))
 proper(0()) -> ok(0())
 proper(U11(X1,X2)) -> U11(proper(X1),proper(X2))
 proper(tt()) -> ok(tt())
 proper(U12(X1,X2)) -> U12(proper(X1),proper(X2))
 proper(s(X)) -> s(proper(X))
 proper(length(X)) -> length(proper(X))
 proper(nil()) -> ok(nil())
 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2))
 U11(ok(X1),ok(X2)) -> ok(U11(X1,X2))
 U12(ok(X1),ok(X2)) -> ok(U12(X1,X2))
 s(ok(X)) -> ok(s(X))
 length(ok(X)) -> ok(length(X))
 top(mark(X)) -> top(proper(X))
 top(ok(X)) -> top(active(X))

Proof:
 Bounds Processor:
  bound: 5
  enrichment: match
  automaton:
   final states: {14,13,12,11,10,9,8,7}
   transitions:
    active3(52) -> 46*
    top1(32) -> 14*
    nil3() -> 53*
    active1(5) -> 32*
    active1(2) -> 32*
    active1(4) -> 32*
    active1(6) -> 32*
    active1(1) -> 32*
    active1(3) -> 32*
    tt3() -> 53*
    proper1(5) -> 32*
    proper1(2) -> 32*
    proper1(4) -> 32*
    proper1(6) -> 32*
    proper1(1) -> 32*
    proper1(3) -> 32*
    03() -> 56*
    ok1(25) -> 25,10
    ok1(27) -> 27,11
    ok1(29) -> 29,12
    ok1(19) -> 32,13
    ok1(21) -> 21,8
    ok1(23) -> 23,9
    ok1(18) -> 32,13
    zeros3() -> 53*
    length1(5) -> 29*
    length1(2) -> 29*
    length1(4) -> 29*
    length1(6) -> 29*
    length1(1) -> 29*
    length1(3) -> 29*
    ok4(59) -> 46*
    s1(5) -> 27*
    s1(2) -> 27*
    s1(4) -> 27*
    s1(6) -> 27*
    s1(1) -> 27*
    s1(3) -> 27*
    cons4(56,53) -> 59*
    cons4(58,38) -> 46*
    U121(3,1) -> 25*
    U121(3,3) -> 25*
    U121(3,5) -> 25*
    U121(4,2) -> 25*
    U121(4,4) -> 25*
    U121(4,6) -> 25*
    U121(5,1) -> 25*
    U121(5,3) -> 25*
    U121(5,5) -> 25*
    U121(6,2) -> 25*
    U121(1,2) -> 25*
    U121(6,4) -> 25*
    U121(1,4) -> 25*
    U121(6,6) -> 25*
    U121(1,6) -> 25*
    U121(2,1) -> 25*
    U121(2,3) -> 25*
    U121(2,5) -> 25*
    U121(3,2) -> 25*
    U121(3,4) -> 25*
    U121(3,6) -> 25*
    U121(4,1) -> 25*
    U121(4,3) -> 25*
    U121(4,5) -> 25*
    U121(5,2) -> 25*
    U121(5,4) -> 25*
    U121(5,6) -> 25*
    U121(6,1) -> 25*
    U121(1,1) -> 25*
    U121(6,3) -> 25*
    U121(1,3) -> 25*
    U121(6,5) -> 25*
    U121(1,5) -> 25*
    U121(2,2) -> 25*
    U121(2,4) -> 25*
    U121(2,6) -> 25*
    active4(59) -> 62*
    active4(39) -> 58*
    U111(2,6) -> 23*
    U111(3,1) -> 23*
    U111(3,3) -> 23*
    U111(3,5) -> 23*
    U111(4,2) -> 23*
    U111(4,4) -> 23*
    U111(4,6) -> 23*
    U111(5,1) -> 23*
    U111(5,3) -> 23*
    U111(5,5) -> 23*
    U111(6,2) -> 23*
    U111(1,2) -> 23*
    U111(6,4) -> 23*
    U111(1,4) -> 23*
    U111(6,6) -> 23*
    U111(1,6) -> 23*
    U111(2,1) -> 23*
    U111(2,3) -> 23*
    U111(2,5) -> 23*
    U111(3,2) -> 23*
    U111(3,4) -> 23*
    U111(3,6) -> 23*
    U111(4,1) -> 23*
    U111(4,3) -> 23*
    U111(4,5) -> 23*
    U111(5,2) -> 23*
    U111(5,4) -> 23*
    U111(5,6) -> 23*
    U111(6,1) -> 23*
    U111(1,1) -> 23*
    U111(6,3) -> 23*
    U111(1,3) -> 23*
    U111(6,5) -> 23*
    U111(1,5) -> 23*
    U111(2,2) -> 23*
    U111(2,4) -> 23*
    top4(62) -> 14*
    cons1(2,6) -> 21*
    cons1(3,1) -> 21*
    cons1(3,3) -> 21*
    cons1(3,5) -> 21*
    cons1(4,2) -> 21*
    cons1(4,4) -> 21*
    cons1(4,6) -> 21*
    cons1(19,18) -> 20*
    cons1(5,1) -> 21*
    cons1(5,3) -> 21*
    cons1(5,5) -> 21*
    cons1(6,2) -> 21*
    cons1(1,2) -> 21*
    cons1(6,4) -> 21*
    cons1(1,4) -> 21*
    cons1(6,6) -> 21*
    cons1(1,6) -> 21*
    cons1(2,1) -> 21*
    cons1(2,3) -> 21*
    cons1(2,5) -> 21*
    cons1(3,2) -> 21*
    cons1(3,4) -> 21*
    cons1(3,6) -> 21*
    cons1(4,1) -> 21*
    cons1(4,3) -> 21*
    cons1(4,5) -> 21*
    cons1(5,2) -> 21*
    cons1(5,4) -> 21*
    cons1(5,6) -> 21*
    cons1(6,1) -> 21*
    cons1(1,1) -> 21*
    cons1(6,3) -> 21*
    cons1(1,3) -> 21*
    cons1(6,5) -> 21*
    cons1(1,5) -> 21*
    cons1(2,2) -> 21*
    cons1(2,4) -> 21*
    cons5(63,53) -> 62*
    nil1() -> 18*
    active5(56) -> 63*
    tt1() -> 18*
    01() -> 19*
    zeros1() -> 18*
    mark1(25) -> 25,10
    mark1(20) -> 32,7
    mark1(27) -> 27,11
    mark1(29) -> 29,12
    mark1(21) -> 21,8
    mark1(23) -> 23,9
    top2(33) -> 14*
    active0(5) -> 7*
    active0(2) -> 7*
    active0(4) -> 7*
    active0(6) -> 7*
    active0(1) -> 7*
    active0(3) -> 7*
    active2(19) -> 33*
    active2(18) -> 33*
    zeros0() -> 1*
    proper2(20) -> 33*
    proper2(19) -> 42*
    proper2(18) -> 41*
    mark0(5) -> 2*
    mark0(2) -> 2*
    mark0(4) -> 2*
    mark0(6) -> 2*
    mark0(1) -> 2*
    mark0(3) -> 2*
    cons2(39,38) -> 40*
    cons2(42,41) -> 33*
    cons0(3,1) -> 8*
    cons0(3,3) -> 8*
    cons0(3,5) -> 8*
    cons0(4,2) -> 8*
    cons0(4,4) -> 8*
    cons0(4,6) -> 8*
    cons0(5,1) -> 8*
    cons0(5,3) -> 8*
    cons0(5,5) -> 8*
    cons0(6,2) -> 8*
    cons0(1,2) -> 8*
    cons0(6,4) -> 8*
    cons0(1,4) -> 8*
    cons0(6,6) -> 8*
    cons0(1,6) -> 8*
    cons0(2,1) -> 8*
    cons0(2,3) -> 8*
    cons0(2,5) -> 8*
    cons0(3,2) -> 8*
    cons0(3,4) -> 8*
    cons0(3,6) -> 8*
    cons0(4,1) -> 8*
    cons0(4,3) -> 8*
    cons0(4,5) -> 8*
    cons0(5,2) -> 8*
    cons0(5,4) -> 8*
    cons0(5,6) -> 8*
    cons0(6,1) -> 8*
    cons0(1,1) -> 8*
    cons0(6,3) -> 8*
    cons0(1,3) -> 8*
    cons0(6,5) -> 8*
    cons0(1,5) -> 8*
    cons0(2,2) -> 8*
    cons0(2,4) -> 8*
    cons0(2,6) -> 8*
    mark2(40) -> 33*
    00() -> 3*
    02() -> 39*
    U110(3,1) -> 9*
    U110(3,3) -> 9*
    U110(3,5) -> 9*
    U110(4,2) -> 9*
    U110(4,4) -> 9*
    U110(4,6) -> 9*
    U110(5,1) -> 9*
    U110(5,3) -> 9*
    U110(5,5) -> 9*
    U110(6,2) -> 9*
    U110(1,2) -> 9*
    U110(6,4) -> 9*
    U110(1,4) -> 9*
    U110(6,6) -> 9*
    U110(1,6) -> 9*
    U110(2,1) -> 9*
    U110(2,3) -> 9*
    U110(2,5) -> 9*
    U110(3,2) -> 9*
    U110(3,4) -> 9*
    U110(3,6) -> 9*
    U110(4,1) -> 9*
    U110(4,3) -> 9*
    U110(4,5) -> 9*
    U110(5,2) -> 9*
    U110(5,4) -> 9*
    U110(5,6) -> 9*
    U110(6,1) -> 9*
    U110(1,1) -> 9*
    U110(6,3) -> 9*
    U110(1,3) -> 9*
    U110(6,5) -> 9*
    U110(1,5) -> 9*
    U110(2,2) -> 9*
    U110(2,4) -> 9*
    U110(2,6) -> 9*
    zeros2() -> 38*
    tt0() -> 4*
    top3(46) -> 14*
    U120(3,1) -> 10*
    U120(3,3) -> 10*
    U120(3,5) -> 10*
    U120(4,2) -> 10*
    U120(4,4) -> 10*
    U120(4,6) -> 10*
    U120(5,1) -> 10*
    U120(5,3) -> 10*
    U120(5,5) -> 10*
    U120(6,2) -> 10*
    U120(1,2) -> 10*
    U120(6,4) -> 10*
    U120(1,4) -> 10*
    U120(6,6) -> 10*
    U120(1,6) -> 10*
    U120(2,1) -> 10*
    U120(2,3) -> 10*
    U120(2,5) -> 10*
    U120(3,2) -> 10*
    U120(3,4) -> 10*
    U120(3,6) -> 10*
    U120(4,1) -> 10*
    U120(4,3) -> 10*
    U120(4,5) -> 10*
    U120(5,2) -> 10*
    U120(5,4) -> 10*
    U120(5,6) -> 10*
    U120(6,1) -> 10*
    U120(1,1) -> 10*
    U120(6,3) -> 10*
    U120(1,3) -> 10*
    U120(6,5) -> 10*
    U120(1,5) -> 10*
    U120(2,2) -> 10*
    U120(2,4) -> 10*
    U120(2,6) -> 10*
    proper3(40) -> 46*
    proper3(39) -> 48*
    proper3(38) -> 47*
    s0(5) -> 11*
    s0(2) -> 11*
    s0(4) -> 11*
    s0(6) -> 11*
    s0(1) -> 11*
    s0(3) -> 11*
    ok2(39) -> 42*
    ok2(38) -> 41*
    length0(5) -> 12*
    length0(2) -> 12*
    length0(4) -> 12*
    length0(6) -> 12*
    length0(1) -> 12*
    length0(3) -> 12*
    nil2() -> 38*
    nil0() -> 5*
    tt2() -> 38*
    proper0(5) -> 13*
    proper0(2) -> 13*
    proper0(4) -> 13*
    proper0(6) -> 13*
    proper0(1) -> 13*
    proper0(3) -> 13*
    ok3(52) -> 33*
    ok3(56) -> 48*
    ok3(53) -> 47*
    ok0(5) -> 6*
    ok0(2) -> 6*
    ok0(4) -> 6*
    ok0(6) -> 6*
    ok0(1) -> 6*
    ok0(3) -> 6*
    cons3(48,47) -> 46*
    cons3(39,38) -> 52*
    top0(5) -> 14*
    top0(2) -> 14*
    top0(4) -> 14*
    top0(6) -> 14*
    top0(1) -> 14*
    top0(3) -> 14*
  problem:
   
  Qed