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

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