MAYBE
0.17/0.28	MAYBE
0.17/0.29	
0.17/0.29	Problem:
0.17/0.29	 active(zeros()) -> mark(cons(0(),zeros()))
0.17/0.29	 active(U11(tt(),V1)) -> mark(U12(isNatList(V1)))
0.17/0.29	 active(U12(tt())) -> mark(tt())
0.17/0.29	 active(U21(tt(),V1)) -> mark(U22(isNat(V1)))
0.17/0.29	 active(U22(tt())) -> mark(tt())
0.17/0.29	 active(U31(tt(),V)) -> mark(U32(isNatList(V)))
0.17/0.29	 active(U32(tt())) -> mark(tt())
0.17/0.29	 active(U41(tt(),V1,V2)) -> mark(U42(isNat(V1),V2))
0.17/0.29	 active(U42(tt(),V2)) -> mark(U43(isNatIList(V2)))
0.17/0.29	 active(U43(tt())) -> mark(tt())
0.17/0.29	 active(U51(tt(),V1,V2)) -> mark(U52(isNat(V1),V2))
0.17/0.29	 active(U52(tt(),V2)) -> mark(U53(isNatList(V2)))
0.17/0.29	 active(U53(tt())) -> mark(tt())
0.17/0.29	 active(U61(tt(),L)) -> mark(s(length(L)))
0.17/0.29	 active(and(tt(),X)) -> mark(X)
0.17/0.29	 active(isNat(0())) -> mark(tt())
0.17/0.29	 active(isNat(length(V1))) -> mark(U11(isNatIListKind(V1),V1))
0.17/0.29	 active(isNat(s(V1))) -> mark(U21(isNatKind(V1),V1))
0.17/0.29	 active(isNatIList(V)) -> mark(U31(isNatIListKind(V),V))
0.17/0.29	 active(isNatIList(zeros())) -> mark(tt())
0.17/0.29	 active(isNatIList(cons(V1,V2))) -> mark(U41(and(isNatKind(V1),isNatIListKind(V2)),V1,V2))
0.17/0.29	 active(isNatIListKind(nil())) -> mark(tt())
0.17/0.29	 active(isNatIListKind(zeros())) -> mark(tt())
0.17/0.29	 active(isNatIListKind(cons(V1,V2))) -> mark(and(isNatKind(V1),isNatIListKind(V2)))
0.17/0.29	 active(isNatKind(0())) -> mark(tt())
0.17/0.29	 active(isNatKind(length(V1))) -> mark(isNatIListKind(V1))
0.17/0.29	 active(isNatKind(s(V1))) -> mark(isNatKind(V1))
0.17/0.29	 active(isNatList(nil())) -> mark(tt())
0.17/0.29	 active(isNatList(cons(V1,V2))) -> mark(U51(and(isNatKind(V1),isNatIListKind(V2)),V1,V2))
0.17/0.29	 active(length(nil())) -> mark(0())
0.17/0.29	 active(length(cons(N,L))) ->
0.17/0.29	 mark(U61(and(and(isNatList(L),isNatIListKind(L)),and(isNat(N),isNatKind(N))),L))
0.17/0.29	 active(cons(X1,X2)) -> cons(active(X1),X2)
0.17/0.29	 active(U11(X1,X2)) -> U11(active(X1),X2)
0.17/0.29	 active(U12(X)) -> U12(active(X))
0.17/0.29	 active(U21(X1,X2)) -> U21(active(X1),X2)
0.17/0.29	 active(U22(X)) -> U22(active(X))
0.17/0.29	 active(U31(X1,X2)) -> U31(active(X1),X2)
0.17/0.29	 active(U32(X)) -> U32(active(X))
0.17/0.29	 active(U41(X1,X2,X3)) -> U41(active(X1),X2,X3)
0.17/0.29	 active(U42(X1,X2)) -> U42(active(X1),X2)
0.17/0.29	 active(U43(X)) -> U43(active(X))
0.17/0.29	 active(U51(X1,X2,X3)) -> U51(active(X1),X2,X3)
0.17/0.29	 active(U52(X1,X2)) -> U52(active(X1),X2)
0.17/0.29	 active(U53(X)) -> U53(active(X))
0.17/0.29	 active(U61(X1,X2)) -> U61(active(X1),X2)
0.17/0.29	 active(s(X)) -> s(active(X))
0.17/0.29	 active(length(X)) -> length(active(X))
0.17/0.29	 active(and(X1,X2)) -> and(active(X1),X2)
0.17/0.29	 cons(mark(X1),X2) -> mark(cons(X1,X2))
0.17/0.29	 U11(mark(X1),X2) -> mark(U11(X1,X2))
0.17/0.29	 U12(mark(X)) -> mark(U12(X))
0.17/0.29	 U21(mark(X1),X2) -> mark(U21(X1,X2))
0.17/0.29	 U22(mark(X)) -> mark(U22(X))
0.17/0.29	 U31(mark(X1),X2) -> mark(U31(X1,X2))
0.17/0.29	 U32(mark(X)) -> mark(U32(X))
0.17/0.29	 U41(mark(X1),X2,X3) -> mark(U41(X1,X2,X3))
0.17/0.29	 U42(mark(X1),X2) -> mark(U42(X1,X2))
0.17/0.29	 U43(mark(X)) -> mark(U43(X))
0.17/0.29	 U51(mark(X1),X2,X3) -> mark(U51(X1,X2,X3))
0.17/0.29	 U52(mark(X1),X2) -> mark(U52(X1,X2))
0.17/0.29	 U53(mark(X)) -> mark(U53(X))
0.17/0.29	 U61(mark(X1),X2) -> mark(U61(X1,X2))
0.17/0.29	 s(mark(X)) -> mark(s(X))
0.17/0.29	 length(mark(X)) -> mark(length(X))
0.17/0.29	 and(mark(X1),X2) -> mark(and(X1,X2))
0.17/0.29	 proper(zeros()) -> ok(zeros())
0.17/0.29	 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2))
0.17/0.29	 proper(0()) -> ok(0())
0.17/0.29	 proper(U11(X1,X2)) -> U11(proper(X1),proper(X2))
0.17/0.29	 proper(tt()) -> ok(tt())
0.17/0.29	 proper(U12(X)) -> U12(proper(X))
0.17/0.29	 proper(isNatList(X)) -> isNatList(proper(X))
0.17/0.29	 proper(U21(X1,X2)) -> U21(proper(X1),proper(X2))
0.17/0.29	 proper(U22(X)) -> U22(proper(X))
0.17/0.29	 proper(isNat(X)) -> isNat(proper(X))
0.17/0.29	 proper(U31(X1,X2)) -> U31(proper(X1),proper(X2))
0.17/0.29	 proper(U32(X)) -> U32(proper(X))
0.17/0.29	 proper(U41(X1,X2,X3)) -> U41(proper(X1),proper(X2),proper(X3))
0.17/0.29	 proper(U42(X1,X2)) -> U42(proper(X1),proper(X2))
0.17/0.29	 proper(U43(X)) -> U43(proper(X))
0.17/0.29	 proper(isNatIList(X)) -> isNatIList(proper(X))
0.17/0.29	 proper(U51(X1,X2,X3)) -> U51(proper(X1),proper(X2),proper(X3))
0.17/0.29	 proper(U52(X1,X2)) -> U52(proper(X1),proper(X2))
0.17/0.29	 proper(U53(X)) -> U53(proper(X))
0.17/0.29	 proper(U61(X1,X2)) -> U61(proper(X1),proper(X2))
0.17/0.29	 proper(s(X)) -> s(proper(X))
0.17/0.29	 proper(length(X)) -> length(proper(X))
0.17/0.29	 proper(and(X1,X2)) -> and(proper(X1),proper(X2))
0.17/0.29	 proper(isNatIListKind(X)) -> isNatIListKind(proper(X))
0.17/0.29	 proper(isNatKind(X)) -> isNatKind(proper(X))
0.17/0.29	 proper(nil()) -> ok(nil())
0.17/0.29	 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2))
0.17/0.29	 U11(ok(X1),ok(X2)) -> ok(U11(X1,X2))
0.17/0.29	 U12(ok(X)) -> ok(U12(X))
0.17/0.29	 isNatList(ok(X)) -> ok(isNatList(X))
0.17/0.29	 U21(ok(X1),ok(X2)) -> ok(U21(X1,X2))
0.17/0.29	 U22(ok(X)) -> ok(U22(X))
0.17/0.29	 isNat(ok(X)) -> ok(isNat(X))
0.17/0.29	 U31(ok(X1),ok(X2)) -> ok(U31(X1,X2))
0.17/0.29	 U32(ok(X)) -> ok(U32(X))
0.17/0.29	 U41(ok(X1),ok(X2),ok(X3)) -> ok(U41(X1,X2,X3))
0.17/0.29	 U42(ok(X1),ok(X2)) -> ok(U42(X1,X2))
0.17/0.29	 U43(ok(X)) -> ok(U43(X))
0.17/0.29	 isNatIList(ok(X)) -> ok(isNatIList(X))
0.17/0.29	 U51(ok(X1),ok(X2),ok(X3)) -> ok(U51(X1,X2,X3))
0.17/0.29	 U52(ok(X1),ok(X2)) -> ok(U52(X1,X2))
0.17/0.29	 U53(ok(X)) -> ok(U53(X))
0.17/0.29	 U61(ok(X1),ok(X2)) -> ok(U61(X1,X2))
0.17/0.29	 s(ok(X)) -> ok(s(X))
0.17/0.29	 length(ok(X)) -> ok(length(X))
0.17/0.29	 and(ok(X1),ok(X2)) -> ok(and(X1,X2))
0.17/0.29	 isNatIListKind(ok(X)) -> ok(isNatIListKind(X))
0.17/0.29	 isNatKind(ok(X)) -> ok(isNatKind(X))
0.17/0.29	 top(mark(X)) -> top(proper(X))
0.17/0.29	 top(ok(X)) -> top(active(X))
0.17/0.29	
0.17/0.29	Proof:
0.17/0.29	 Open
0.17/0.29	EOF