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The so-called logical triangle is the product of concretizing the pyramid structure. The bottom of the length of the triangle represents the comprehensiveness of the factual basis, and the height represents the strength of the Sowhat (or Why) connection. In other words, the key is to use enough and balanced fact mats to construct the logic that tightly connects Sowhat and Why.Liskov 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:Chapter IV Fire Protection Technical Service Activities不过是个可怜的孩子而已，只因生在帝王之家和这个特殊的年代里，他的人生是注定悲剧的。　　梁口市兴达贸易公司董事长谭江被秘密绑架，谭江嘱夫人不要报案。谭夫人依言取出赎金，放在家中。绑匪竟上门取走，真是胆大妄为。大楚皇后姚莫心在朝中被奸人所害，而一场雷雨闪电之后，她的魂魄却到了妹妹姚莫婉体内，而姚莫婉此刻正在被敌人追杀，在危机时刻掉下悬崖失去了记忆。姚莫婉与大楚肃亲王夜君清在一系列的阴差阳错之下逐渐相爱，可就在两人都想互表心意的当头，姚莫婉知道了自己就是姚莫心的事实，也知道了自己曾经被仇人所暗害。为了报仇，姚莫心凭借妹妹姚莫婉的身体，再次进入皇宫。初入皇宫之时，姚莫婉在几个妃子之间找到了杀害姐姐莫心的仇人，并认识到了皇帝夜鸿弈的本质，狠下心来要替夜君清夺回江山。为了复仇，姚莫婉先后结识楚漠北、寒锦衣等痴情而又无所求的各色人物，欠下数不清的情债。姚莫婉终于实现自己的承诺，报了血海深仇，也还心爱之人夜君清锦绣河山。