MAYBE

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

Proof Output:    
  The input cannot be shown compatible