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:
    {  a(x1) -> x1
     , a(b(b(x1))) -> b(b(b(c(x1))))
     , c(b(x1)) -> a(a(x1))}

Proof Output:    
  The input cannot be shown compatible