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This chapter is the last lecture on design patterns. It will talk about the third design pattern-behavioral pattern, with a total of 11 types: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern. I have been writing about design patterns for a long time. At last it's halfway through, Writing a blog post is a very time-consuming thing, Because I have to be responsible for the readers, Whether it's graphs, codes, or representations, Everyone hopes to write it as clearly as possible so that readers can understand it. I think both I and the readers hope to see high-quality blog posts come out. Starting from myself, I will stick to it and update it continuously. The continuous motivation comes from the continuous support of readers and friends. I will do my best to write every article well! I hope everyone can give opinions and suggestions continuously and jointly create a perfect blog post!The third match will be played by C and the winner of the first match, so that everyone can play 2 matches and still keep the suspense of the match.京城刑警李慧炎（段奕宏 饰）因一起绑架案，来到东北小城双塔，机缘巧合下，与前来寻找父亲被杀真相的入殓师周游（大鹏 饰）相识。二人意外卷入一宗横跨二十六年的恩怨纠葛……夜幕收起，白日笼罩。在一座矗立北方的冻土之城，十二个日夜，向观众揭示一个关于人性的秘密。“双探”于冰冻之寒下的人性涅槃重生……7.4 Unqualified after thoracic organ surgery.4个普通的年轻人过着得过且过的生活。某天，往学校的途中遇见了不良少年们找碴，被打得落花流水而计画復仇。就在復仇计画实行当天，不良少年们的学校居然因爆炸而陷入一片火海当中，而自己也被当成 爆炸事件嫌疑犯。「逃」是他们唯一的路。