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Step 3: Learn knowledgeNow, 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.　　周志豪带女儿回到2020年，并让淇淇入读马博士十二岁时所读之英才国际小学。为免引人注目，他化身为平庸之交通警察，平日装傻扮蠢，极之低调，但上司年青警官小马哥及便衣女警探娥姐对他关怀备至。娥姐更芳心暗许，但由于有职责在身，及对美莉一直未能忘情，周志豪不断逃避娥姐的好意！小小宠物店（英语：Littlest Pet Shop）是HUB频道的动画。本作描述一名高中女孩布莱丝和她的单亲爸爸搬家到纽约市中心镇的一家一楼设有宠物店的公寓顶楼，结果布莱丝无意发现自己听的懂店中宠物说的话，而且还和它们成了好朋友。剧中还以大量的音乐穿插在其中为特色。不仅如此，制作团队因为本作是以流行的概念，所以布莱丝每集登场都以不同服装亮相，而裁缝、设计服装布莱丝她本人最大专长和嗜好。Chapter II Qualification Conditions不是我。Then switch to container to see if the file exists: