MAYBE
146.97/55.35	MAYBE
146.97/55.35	
146.97/55.35	Problem:
146.97/55.35	 a(a(b(x1))) -> b(b(a(a(x1))))
146.97/55.35	 b(a(b(a(x1)))) -> a(a(a(b(x1))))
146.97/55.35	
146.97/55.35	Proof:
146.97/55.35	 Open
146.97/55.35	EOF