MAYBE
146.06/55.48	MAYBE
146.06/55.49	
146.06/55.49	Problem:
146.06/55.49	 a(a(a(a(x1)))) -> b(a(a(b(x1))))
146.06/55.49	 b(a(b(x1))) -> a(b(a(x1)))
146.06/55.49	
146.06/55.49	Proof:
146.06/55.49	 Open
146.06/55.49	EOF