197.26/50.44	MAYBE
197.26/50.44	
197.26/50.44	Problem:
197.26/50.44	 a(a(a(a(x1)))) -> b(a(a(b(x1))))
197.26/50.44	 b(a(b(x1))) -> a(b(a(x1)))
197.26/50.44	
197.26/50.44	Proof:
197.26/50.44	 Open
197.26/50.45	EOF