MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  primes() -> sieve(from(s(s(0()))))
     , from(X) -> cons(X, from(s(X)))
     , head(cons(X, Y)) -> X
     , tail(cons(X, Y)) -> Y
     , if(true(), X, Y) -> X
     , if(false(), X, Y) -> Y
     , filter(s(s(X)), cons(Y, Z)) ->
       if(divides(s(s(X)), Y),
          filter(s(s(X)), Z),
          cons(Y, filter(X, sieve(Y))))
     , sieve(cons(X, Y)) -> cons(X, filter(X, sieve(Y)))}

Proof Output:    
  The input cannot be shown compatible
The following warning(s) occured:

 Warning when parsing problem:
   Unsupported strategy 'OUTERMOST'