MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { f(x, 0()) -> s(0()) , f(s(x), s(y)) -> s(f(x, y)) , g(0(), x) -> g(f(x, x), x) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..