MAYBE
158.42/61.95	MAYBE
158.42/61.95	
158.42/61.95	Problem:
158.42/61.95	 b(b(b(x1))) -> a(a(b(x1)))
158.42/61.95	 b(a(a(x1))) -> a(a(b(x1)))
158.42/61.95	 a(a(x1)) -> b(a(b(x1)))
158.42/61.95	
158.42/61.95	Proof:
158.42/61.95	 Open
158.42/61.96	EOF