Problem:
 b() -> a()
 b() -> c()
 c() -> h(b())
 c() -> d()
 a() -> h(a())
 d() -> h(d())

Proof:
 Nonconfluence Processor:
  terms: a() *<- b() ->* d()
  Qed
  
  first automaton:
   final states: {10}
   transitions:
    a() -> 10*
    h(10) -> 10*
  
  second automaton:
   final states: {9}
   transitions:
    h(9) -> 9*
    d() -> 9*