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The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:　　郑军则娶到了方丽堂妹美艳的方红，方红为郑军生下一子，生活美满而幸福。案件一直悬而未破。明白了……倘若浙江设军器坊……那就方便多了。The design stage of subway station comprehensive pipeline lags behind the design stage of civil engineering, wind, water and other pipeline schemes, and the design of comprehensive pipeline shall be specialized in civil engineering, wind, water and other pipelines.为了呈现优质的画面美感、动人心弦的剧情和演员阵容，北京东王文化公司特地组合霍建华、孙俪、姚采颖、胡宇崴双生双旦，演绎一场浪漫悲伤交杂的爱情故事，将不惜花费大成本前往英国、上海、海南等地拍摄，将雪地的英伦浪漫、上海风情演绎的美轮美奂。