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The fourth bead is coming对于夺取赵国这件事情，刘邦对韩信还是比较有信心的。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.2. Designated equipment can be synthesized by using different levels of equipment souls.　　在一骠和其母亲的悉心照顾下，怀仙顺利康复，而他的危险却仍旧未被解除。怕有后患的冷子京派他的女儿冷艳（樊亦敏 饰）前来追杀怀仙，但冷艳却在得知真相后，开始对怀仙暗生情愫。他们在逃亡的过程中，邂逅了冷心。一群人阴差阳错的得到了秘籍“七杀真经”，众人从秘籍中练就了绝世武功，开始准备反扑……Let's think about another problem. We have placed a string of rules on each "chain", but some of these rules are very similar. For example, Class A rules filter IP or ports and Class B rules modify messages. At this time, can we put together the rules that realize the same function? We must be able to do so.(1) Special Hardware