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

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