MAYBE

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

Proof Output:    
  The input cannot be shown compatible