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诗选类剧集《随意芝加哥》由乔·斯万伯格担任创剧人，讲述了形形色色的芝加哥人如何在现代社会的爱情、新爱、科技与文化迷宫里蹒跚前行。这部八集电视剧由斯万伯格担任编剧和导演，演员阵容包括奥兰多·布鲁姆、玛琳·阿克曼、杰克·约翰森、马克·马龙、戴夫·弗兰科、汉尼拔·布列斯、艾蜜莉·瑞特考斯基、迈克尔·切鲁斯、古古·玛芭塔-劳、阿雅·卡什、简·亚当斯、伊莉莎白·里瑟和伊万·约尼杰特等。马莱伊不情愿地嫁给了拥有一栋新房子的朗·维萨恩，却没有意识到他是同性恋。这是爱情悲剧故事的开始。So at the moment, We're on another machine, Use the ping command to send a message to the current machine. As shown in the following figure, the ping command can be responded to, proving that the message sent by the ping command has been normally sent to the host where the firewall is located. The IP address of the machine where the ping command is located is 146, and the IP address of the host currently testing the firewall is 156. We will use this environment to demonstrate the operation of iptables.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:他们的想法很简单：就是这事越被传扬开来，对胡家越有利。　当一名职业杀手发现他最新的目标具有超自然能力，并与他亡妻的死亡有关时，他开始胡作乱，把他的目标变成了对付雇佣他的腐败官员的武器。