MAYBE
109.51/55.32	MAYBE
109.51/55.32	
109.51/55.32	Problem:
109.51/55.32	 a(x1) -> b(x1)
109.51/55.32	 b(b(x1)) -> x1
109.51/55.32	 b(c(c(x1))) -> c(c(a(c(b(x1)))))
109.51/55.32	
109.51/55.32	Proof:
109.51/55.32	 Open
109.51/55.32	EOF