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

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