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:
    {  g(a()) -> g(b())
     , b() -> f(a(), a())
     , f(a(), a()) -> g(d())}

Proof Output:    
  The input cannot be shown compatible