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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.Difference mode. According to the brightness distribution of the colors on the upper and lower sides, the color values of the upper and lower pixels are subtracted. For example, if the maximum white value is used for Difference operation, the inverted effect will be obtained (the lower color is subtracted to obtain the complement value), while if the black value is used, there will be no change (the black brightness is the lowest, the lower color subtracts the minimum color value of 0, and the result is the same as before).《栀子花开2015》讲述一群年轻人为实现一个年轻人的梦想而拼搏”的热血故事，一段围绕着一对老同学言蹊、许诺而展开的兜兜转转的青春爱情故事，板栗见皇帝皱眉，铿锵言道：皇上，市井百姓日常纷争，不可能全经官府，自来有他们一套处置方法，大家心中更有一副尺度，仿若头上悬了一柄尚方宝剑，轻易不敢为非作歹，否则，定会为世情所不容。他绞尽脑汁，苦思冥想。