TRS: { from(X) -> cons(X, n__from(n__s(X))), length(n__nil()) -> 0(), length(n__cons(X, Y)) -> s(length1(activate(Y))), length1(X) -> length(activate(X)), from(X) -> n__from(X), s(X) -> n__s(X), nil() -> n__nil(), cons(X1, X2) -> n__cons(X1, X2), activate(n__from(X)) -> from(activate(X)), activate(n__s(X)) -> s(activate(X)), activate(n__nil()) -> nil(), activate(n__cons(X1, X2)) -> cons(activate(X1), X2), activate(X) -> X} Fail