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Iterative sub-patterns: Iterative sub-patterns can sequentially access elements in an aggregation without exposing the internal appearance of the aggregation. The aggregation of multiple objects is called aggregation. Aggregation objects are container objects that can contain a group of objects. Iterative subpatterns encapsulate iterative logic into a separate subobject, thus separating it from the aggregation itself. Iterative subpatterns simplify the aggregated interface. Each aggregated object can have one or more iterative subobjects, and the iterative states of each iterative subobject can be independent of each other. Iterative algorithms can be independent of aggregation role changes.A few days ago, the circle of friends was swept by such a video:Artillery has 3 skills. The first is long-range bombing, the second is the big move of Elemental Shaman, which explodes people, and the third is to go back.DDoS attacks target the TCP/IP infrastructure in the network. These attacks can be divided into three types: one is to exploit a known flaw in the TCP/IP stack汉王您想要，之前您在巴蜀的时候，刘邦之所以要以您的父母兄嫂和子女为人质，怕的就是汉王您反叛。Chapter 4为与东吴联姻抗曹，娶了孙权之妹。