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The execution results are consistent with the previous code, but the benefits of using the state mode are obvious. It can localize the relationship between each state and its corresponding behaviors, which are scattered and encapsulated in their corresponding state classes, making it easy to read and manage the code. In addition, the switching between states is distributed within the state class, which makes it unnecessary to write too many if, else conditional branch languages to control the switching between states.所过之处，人们都望着他们。黎章却神情淡然，且眼底有隐忧。有那么死心塌地？不然呢？夫人方不方便帮个忙？员外请讲。Fourth, due to the need to monitor teachers' course arrangement and class attendance online, with the increase in the number of students, the technical requirements for teacher management are higher.紧跟着就听说这张家儿子把九十万两白银分别捐给书院、医学院和皇家慈善机构，还当众劝人戒赌。Netfilter/iptables (hereinafter referred to as iptables) constitute the packet filtering firewall under Linux platform. Like most Linux software, this packet filtering firewall is free of charge. It can replace expensive commercial firewall solutions and complete the functions of packet filtering, packet redirection and network address translation (NAT).