MAYBE

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

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