MAYBE

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

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