195.63/50.00	MAYBE
195.63/50.00	
195.63/50.00	Problem:
195.63/50.00	 a(x1) -> x1
195.63/50.00	 a(b(a(x1))) -> a(x1)
195.63/50.00	 b(a(a(b(x1)))) -> a(a(a(a(b(b(b(x1)))))))
195.63/50.00	 a(a(a(a(x1)))) -> b(x1)
195.63/50.00	
195.63/50.00	Proof:
195.63/50.00	 Open
195.63/50.00	EOF