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4. The switching relationship between states is just piling up if and else statements in the buttonWasPressed method. Adding or modifying a state may require changing several operations, which makes buttonWasPressed more difficult to read and maintain.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.包公奇案之双城记初始扑朔迷离，错综复杂，但包公厉眼如炬，洞察秋毫，往往从蛛丝马迹入手，调查取证为据，排除干扰势力，巧用智谋，最终真相大白，使罪犯无所遁形……Praise! ! ! ! ! ! ! ! ! ! ! ! ! !　　艾米丽•索恩（Emily Thorne）（艾米丽•凡坎普，Emily Van Camp饰）初到汉普斯顿，她遇见了一些富有的邻居，结识了一些朋友，她似乎渐渐融入了这个小镇。但是，一个年轻的女孩一个人住在这个富有的小镇上，这是一件挺不常见的事。其实，艾米丽对于这个小镇来说，并不是个新人。事实上，她曾经居住于此——那是在一些毁掉了她的家庭和家人声誉的坏事发生之前。现在艾米丽回来了，她用了她所知道的最好的方法去纠正之前的那些错误——这个方法就是：复仇。Jiang Xiaolong picked up a harpoon and jumped onto the raft. Ding Yumin and Ding Yumin were also planted in the water. Jiang Xiaolong was very angry and cursed Ding Yumin. He didn't expect Ding to run away. They had hijacked the boat together.