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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!影片讲述的是憨厚朴实的山里娃铁头（来喜饰演），由于没钱娶心上人进城去找表哥杨伟（于非饰演）讨债的过程中结识了在城里开赌场的海哥（刘桦饰演），并发生了一系列令人捧腹的故事……俞大猷不禁又是泯然一叹，倭人擅游击，我们就等他们攻坚。等等This net news (chemical materials college) "this is nothing, it is all I should do. Compared with the important task of training talents, this small matter is nothing." This is what Mr. Sun Yimin said to the team members after the team members thanked Mr. Sun after the summer social practice activity of "Research on Innovative Enterprises in Wuhu" was completed by the School of Chemical Materials of Anhui Normal University. The simple words hit the floor were deeply imprinted in the hearts of every member of the team.