MAYBE
137.66/55.38	MAYBE
137.66/55.38	
137.66/55.38	Problem:
137.66/55.38	 a(a(a(x1))) -> b(b(b(x1)))
137.66/55.38	 b(b(b(b(x1)))) -> a(b(b(a(x1))))
137.66/55.38	
137.66/55.38	Proof:
137.66/55.38	 Open
137.66/55.38	EOF