MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { f(g(x)) -> g(f(f(x))) , f(h(x)) -> h(g(x)) , f'(s(x), y, y) -> f'(y, x, s(x)) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..