MAYBE
153.93/55.30	MAYBE
153.93/55.30	
153.93/55.30	Problem:
153.93/55.30	 a(b(a(x1))) -> b(b(b(a(x1))))
153.93/55.30	 b(b(b(a(x1)))) -> a(a(a(b(x1))))
153.93/55.30	
153.93/55.30	Proof:
153.93/55.30	 Open
153.93/55.31	EOF