MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  -(x, 0()) -> x
     , -(0(), s(y)) -> 0()
     , -(s(x), s(y)) -> -(x, y)
     , f(0()) -> 0()
     , f(s(x)) -> -(s(x), g(f(x)))
     , g(0()) -> s(0())
     , g(s(x)) -> -(s(x), f(g(x)))}

Proof Output:    
  The input cannot be shown compatible