221.79/50.37	MAYBE
221.79/50.37	
221.79/50.37	Problem:
221.79/50.37	 a(a(a(x1))) -> a(a(b(b(x1))))
221.79/50.37	 b(b(b(b(x1)))) -> a(b(a(a(x1))))
221.79/50.37	
221.79/50.37	Proof:
221.79/50.37	 Open
222.11/50.37	EOF