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

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