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:
    {  from(X) -> cons(X, from(s(X)))
     , first(0(), Z) -> nil()
     , first(s(X), cons(Y, Z)) -> cons(Y, first(X, Z))
     , sel(0(), cons(X, Z)) -> X
     , sel(s(X), cons(Y, Z)) -> sel(X, Z)}

Proof Output:    
  The input cannot be shown compatible