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Macro commands: d, df, f, d, df, f317Secondly, we should improve our concentration and use fixed time, do fixed things and not be disturbed to improve our concentration.Visitor pattern is suitable for systems with relatively stable data structures. It disconnects the coupling between data structures and operations acting on structures, allowing the set of operations to evolve relatively freely.而我们烧毁黄龙洞的粮草，则发生在大战中，两国交战，当然要各逞手段。The basic structure of the code is seen above, but we also need an initialization method. The code is as follows:The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.