MAYBE

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict Trs:
  { and(true(), X) -> X
  , and(false(), Y) -> false()
  , if(true(), X, Y) -> X
  , if(false(), X, Y) -> Y
  , add(0(), X) -> X
  , add(s(X), Y) -> s(add(X, Y))
  , first(0(), X) -> nil()
  , first(s(X), cons(Y, Z)) -> cons(Y, first(X, Z))
  , from(X) -> cons(X, from(s(X))) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..