197.83/50.44	MAYBE
197.83/50.45	
197.83/50.45	Problem:
197.83/50.45	 a(a(a(x1))) -> b(b(b(x1)))
197.83/50.45	 b(a(a(b(x1)))) -> x1
197.83/50.45	 b(a(a(b(x1)))) -> b(a(a(a(b(x1)))))
197.83/50.45	
197.83/50.45	Proof:
197.83/50.45	 Open
197.83/50.45	EOF