198.89/50.92	MAYBE
198.89/50.92	
198.89/50.92	Problem:
198.89/50.92	 b(b(b(a(x1)))) -> a(b(a(a(x1))))
198.89/50.92	 a(a(a(a(x1)))) -> b(a(a(b(x1))))
198.89/50.92	 a(a(a(b(x1)))) -> b(b(b(b(x1))))
198.89/50.92	
198.89/50.92	Proof:
198.89/50.92	 Open
198.89/50.93	EOF