TRS: { f(X) -> cons(X, n__f(n__g(X))), g(0()) -> s(0()), g(s(X)) -> s(s(g(X))), sel(0(), cons(X, Y)) -> X, sel(s(X), cons(Y, Z)) -> sel(X, activate(Z)), f(X) -> n__f(X), g(X) -> n__g(X), activate(n__f(X)) -> f(activate(X)), activate(n__g(X)) -> g(activate(X)), activate(X) -> X} Fail