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Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.纯洁的特蕾西在陶尔哈姆莱茨区的宗教家庭长大。她准备充分发挥自己的潜力，而第一步便是脱离处女。? Output: this is mailsender!At the beginning of marriage, it must be beautiful and happy. Only in the process of marriage, both parties constantly hurt it, it will collapse.好友田村突然在旅游时发生事故死亡，另一好友美惠自杀，编辑部里的老师又突然住院很快病危，同事国中乘坐出租车发生不测……接二连三的事故现场，筱原都看到同一个身着和服的小女孩。（保坂尚輝、浅香唯饰）