199.14/50.67	MAYBE
199.14/50.67	
199.14/50.67	Problem:
199.14/50.67	 a(a(a(a(x1)))) -> b(a(a(a(x1))))
199.14/50.67	 a(b(b(b(x1)))) -> b(a(b(a(x1))))
199.14/50.67	 b(b(a(a(x1)))) -> a(b(b(a(x1))))
199.14/50.67	
199.14/50.67	Proof:
199.14/50.67	 Open
199.14/50.67	EOF