Problem:
 a() -> a()
 f(h(a(),a())) -> f(b())
 c() -> b()

Proof:
 Uncurry Processor:
  a() -> a()
  f5(f(),f5(f5(h(),a()),a())) -> f5(f(),b())
  c() -> b()
  Ground Confluence Processor:
   confluent by decision procedure.