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

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