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The reusability of the algorithm is poor. If there are similar algorithms in other places, but the rules are different, our codes cannot be used universally.张荣日与阿豪虽同为劳役中心内之少年犯，但有志向上，在高级程度会考中成绩优异。出狱后，荣日住英伦修读法律课程，阿豪则因家境问题不能继续升学。工作期间，阿豪受马超威迫勒索，虽藉劳役中心朋友关系，解决事件，但却种下祸根。六年后，荣日学成归来，豪亦有小成。人重逢，高兴万分，不料马超施计血亚豪报复，奸杀其妻，更嫁祸於豪。在荣日帮忙下，豪终洗脱罪名，但杀妻仇深，豪杀马超，为妻报仇，而荣日亦无奈目送好友重返囚笼。青山笑道：都要教。《神通乡巴佬》中，王宝强饰演一个叫“楚中天”的乡巴佬。因为小时候写自己的名字松散凌乱，“楚中天”被老师同学称呼为“林蛋大”。林蛋大嫌自己相貌丑陋，发誓要娶个漂亮媳妇改善下一代的基因，于是揣着20万老本进城去实现自己的理想。路上遇见了穷困潦倒的中年男人朱肚皮（朱月坡），朱月坡为给儿子出国留学凑齐保证金，使用“骗术”，瞄准了林蛋大兜里的钱。We call a collection of rules that have the same functionality a table, Therefore, we can place rules with different functions in different tables for management, and IPTables has already defined four tables for us, each table corresponds to different functions, and the rules we define cannot escape the scope of these four functions. Therefore, before learning IPTables, we must first understand the function of each table.Let's first implement the following simple publish-subscribe mode. The code is as follows: