MAYBE
42.37/10.54	MAYBE
42.37/10.54	
42.37/10.54	Problem:
42.37/10.54	 a(x1) -> x1
42.37/10.54	 a(a(b(x1))) -> c(b(b(a(a(x1)))))
42.37/10.54	 b(c(x1)) -> a(x1)
42.37/10.54	
42.37/10.54	Proof:
42.37/10.54	 Open
42.37/10.55	EOF