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