MAYBE
142.70/55.35	MAYBE
142.70/55.35	
142.70/55.35	Problem:
142.70/55.35	 a(a(a(x1))) -> a(a(b(b(x1))))
142.70/55.35	 b(b(b(b(x1)))) -> a(b(a(a(x1))))
142.70/55.35	
142.70/55.35	Proof:
142.70/55.35	 Open
142.70/55.35	EOF