YES(?,ELEMENTARY)

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           YES(?,ELEMENTARY)
Input Problem:    innermost runtime-complexity with respect to
  Rules: {f(g(x), y, y) -> g(f(x, x, y))}

Proof Output:    
  Strict Rules in Predicative Notation:
   {f(g(; x); y, y) -> g(; f(x; x, y))}
  Safe Mapping:
   safe(f) = {2, 3}, safe(g) = {1}
  Argument Permutation:
   mu(f) = [3, 2, 1]
  Precedence:
   f ~ f