MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  f(x, x) -> f(0(), 1())
     , 0() -> 2()
     , 1() -> 2()
     , f(x, 2()) -> 2()
     , f(2(), x) -> 2()}

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

 Warning when parsing problem:
   Unsupported strategy 'OUTERMOST'