MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { g(x, y) -> x , g(x, y) -> y , f(x, y, s(z)) -> s(f(0(), 1(), z)) , f(0(), 1(), x) -> f(s(x), x, x) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..