MAYBE
87.63/55.32	MAYBE
87.63/55.32	
87.63/55.32	Problem:
87.63/55.32	 a(x1) -> x1
87.63/55.32	 b(b(x1)) -> a(x1)
87.63/55.32	 b(c(c(x1))) -> c(c(b(c(b(x1)))))
87.63/55.32	
87.63/55.32	Proof:
87.63/55.32	 Open
87.63/55.32	EOF