MAYBE

Problem:
 f(y,f(y,x)) -> f(f(a(),y),f(a(),y))

Proof:
 DP Processor:
  DPs:
   f#(y,f(y,x)) -> f#(a(),y)
   f#(y,f(y,x)) -> f#(f(a(),y),f(a(),y))
  TRS:
   f(y,f(y,x)) -> f(f(a(),y),f(a(),y))
  Open