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

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