MAYBE

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

Proof Output:    
  The input cannot be shown compatible