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(b(x)) -> b(b(a(a(x))))}

Proof Output:    
  The input cannot be shown compatible
The following warning(s) occured:

 Warning when parsing problem:
   Unsupported strategy 'OUTERMOST'