MAYBE

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

Strict Trs:
  { zeros() -> cons(0(), zeros())
  , U11(tt(), L) -> U12(tt(), L)
  , U12(tt(), L) -> s(length(L))
  , length(cons(N, L)) -> U11(tt(), L)
  , length(nil()) -> 0() }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..