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

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