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