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/blinkThe essence of these 23 design patterns is the practical application of object-oriented design principles, and it is a full understanding of the encapsulation, inheritance and polymorphism of classes, as well as the association and combination of classes.Figure 2We 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.一个交织的故事，姓，毒榀，摇滚和悲伤。As a final note, we encourse you to enjoy this experience the way we did, to go out there and explore this fascinating world of texts and colors through what nature has to offer, through the fabrics we show and wear; And to not hesitate to share and exchange with us thoughts on this technology.