MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { zeros() -> cons(0(), zeros()) , and(tt(), X) -> X , length(cons(N, L)) -> s(length(L)) , length(nil()) -> 0() , take(0(), IL) -> nil() , take(s(M), cons(N, IL)) -> cons(N, take(M, IL)) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..