MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  f(tt(), x) -> f(isDouble(x), s(s(x)))
     , isDouble(s(s(x))) -> isDouble(x)
     , isDouble(0()) -> tt()}

Proof Output:    
  The input cannot be shown compatible