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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.NBA game is 48 minutes, divided into 4 quarters, each quarter is 12 minutes.Therefore, the essence of deliberate practice is to buy SSD hard disks, not to sell coolies, not to help best-selling authors market, shouting warm-blooded slogans: 10,000 hours, today, do you insist?With the in-depth interrogation of Jia Hongwei, the truth of a major robbery and massacre at sea that shocked the world was finally revealed in front of everyone's eyes.Finally, let's do some testing work:在泰国，大多数大学都有新生欢迎活动，但对于部分大学新生来说，这并不是一件令人期待的事。因为在少数高校，高年级学生会借机“欺负”，甚至是“羞辱”新生，而“欺负”的传统呢。