197.52/50.46	MAYBE
197.52/50.46	
197.52/50.46	Problem:
197.52/50.46	 a(a(a(x1))) -> b(b(b(x1)))
197.52/50.46	 b(b(b(b(x1)))) -> a(b(b(a(x1))))
197.52/50.46	
197.52/50.46	Proof:
197.52/50.46	 Open
197.52/50.47	EOF