MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  filter(cons(X, Y), 0(), M) -> cons(0(), filter(Y, M, M))
     , filter(cons(X, Y), s(N), M) -> cons(X, filter(Y, N, M))
     , sieve(cons(0(), Y)) -> cons(0(), sieve(Y))
     , sieve(cons(s(N), Y)) -> cons(s(N), sieve(filter(Y, N, N)))
     , nats(N) -> cons(N, nats(s(N)))
     , zprimes() -> sieve(nats(s(s(0()))))}

Proof Output:    
  The input cannot be shown compatible