TRS: { f(n__f(n__a())) -> f(n__g(f(n__a()))), f(X) -> n__f(X), a() -> n__a(), g(X) -> n__g(X), activate(n__f(X)) -> f(X), activate(n__a()) -> a(), activate(n__g(X)) -> g(X), activate(X) -> X} Fail