Problem: b() -> c() h(b(),b()) -> a() h(c(),c()) -> c() c() -> c() Proof: Nonconfluence Processor: terms: h(b(),c()) *<- h(b(),b()) ->* a() Qed first automaton: final states: {5} transitions: b() -> 7* c() -> 5,7,6 h(7,6) -> 5* second automaton: final states: {8} transitions: a() -> 8*