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1. Columns of command modeLiskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:iKON网络团综《iKON的心动青春旅行》2018年7月4日首播~！由YG与某手机平台共同投资制作的iKON全新团综《iKON的心动青春旅行》将于今天下午8时首播。该节目是一档成员们前往夏威夷展开的旅行真人秀治愈节目，共分为10期，每周三、周六下午6时播出。董小翠之死完全是意外，掳掠大苞谷更是因为你张家。一心奋斗的北漂女青年许可，刚落地就收到了combo打击，实习期刚结束就被裁，一同北漂的男友晓兵，找不到体面的工作，硕士毕业生最后沦落卤煮火烧店做了一名掌勺。这北漂能实现什么理想？许可快刀斩乱麻和晓兵分了手，人生似乎出现了转机，一份高薪的新媒体运营工作在向许可招手，而过关斩将的关键点似乎就在设计师大V老麦的身上，至于和老麦是在某交友软件上遇到的，一切都不重要了。。。知府恍然大悟，急忙让调来清辉县三月份县试案卷查阅，至此才明白殷夫子所谓何来。Standing in the squares on both sides of Baiting, the octagonal five-story pavilion-like wood-like stone pagoda, which is about 200 meters apart, is Quanzhou's East and West Pagoda and is one of the four famous towers in the country. The East Tower is called "Zhenguo Tower" and has a height of 48.24 meters. The name of the West Tower is "Renshou Tower", with a height of 44.06 meters, slightly lower than that of the East Tower, and its scale is almost exactly the same as that of the East Tower. The two towers are treasures of ancient stone structures in our country and are symbols of Quanzhou, a famous historical and cultural city.