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Leave a message and take up a place ~尉缭说道：楚汉两国媾和，不仅仅是他们两个诸侯国的事情，可是关系到全天下的形势。(2) When the two ships are windy on the same side, the windward ship shall give way to the downwind ship;Deletes all rules in the specified chain of the specified table. The-F option means to empty the rules in the corresponding chain. Think twice when executing.Make a template and define the calling order and method in the template. Different subclasses implement methods with their own characteristics, and then access the calling methods of subclasses when accessing externally.说清楚，别嚼饭。B) It is suggested to start from a simple scene and discover or design a certain pattern by yourself. From this, you can understand how the model solves the problem. In this way, the model becomes your own thing, and you will not have the problem that it is easier said than done. All design patterns are just the application of basic principles and concepts in specific occasions. You may not know the name of a design pattern, but you know all its advantages, disadvantages, variants and applications. Seeing mountains is not mountains, seeing water is not water.