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

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