MAYBE

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

Proof Output:    
  The input cannot be shown compatible