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2. Waiting for the installation to be completedClick on the green box of "Manaka" (the one-day ticket in the above picture is now updated to the 24-hour subway ticket, see the following subway ticket introduction for details)周菡对他印象不错，闻言忙谢过他，又道：姐姐姓周，单名一个菡字。现在却没有多余的时间懊恼，两队人马迅速罢斗，改为并肩作战。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu三位年轻的足球运动员在一家虚构的英超俱乐部的不幸遭遇。This vulnerability allows an attacker to create an IP packet that exceeds the IP standard maximum limit of 65536 bytes.