MAYBE
216.81/55.40	MAYBE
216.81/55.40	
216.81/55.40	Problem:
216.81/55.40	 a(a(a(x1))) -> a(b(b(x1)))
216.81/55.40	 b(a(b(x1))) -> a(b(a(x1)))
216.81/55.40	
216.81/55.40	Proof:
216.81/55.40	 Open
216.81/55.40	EOF