226.44/50.67	MAYBE
226.44/50.67	
226.44/50.67	Problem:
226.44/50.67	 b(b(a(b(x1)))) -> b(a(b(b(b(b(x1))))))
226.44/50.67	 b(a(b(b(x1)))) -> b(b(b(x1)))
226.44/50.67	 b(b(b(x1))) -> b(b(a(a(b(a(b(x1)))))))
226.44/50.67	
226.44/50.67	Proof:
226.44/50.67	 Open
226.44/50.68	EOF