MAYBE

'Pop* with parameter subtitution (timeout of 60.0 seconds)'
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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