MAYBE
102.53/55.34	MAYBE
102.53/55.34	
102.53/55.34	Problem:
102.53/55.34	 a(x1) -> x1
102.53/55.34	 a(a(b(b(x1)))) -> b(b(a(a(b(a(x1))))))
102.53/55.34	
102.53/55.34	Proof:
102.53/55.34	 Open
102.53/55.34	EOF