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