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In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:偏有张家照应着，又活得有滋有味的。章邯又道：多谢赵大人，还有一事故事将主要讲述年轻的FBI女特工OliviaWarren（AnnaTorv扮演）奉命加入代号为“Fringe（边缘）”的秘密部门，与高深莫测的神秘科学家WalterBishop博士（JohnNoble扮演）合作调查一系列无法用科学解释的超自然现象。随着这些现象愈演愈烈，两人逐渐发现，其中有些麻烦可能是WalterBishop自己的研究所导致的，而更多的麻烦则和秘密的顶级研究机构“普罗米修斯公司”有关……真相一点一点被揭开，秘密却越来越深。　　十年来唐伟聪凭着坚毅不屈、踏实刻苦的工作态度，多年来破获不少贪污案件，后来晋升为总调查主任。In order to use SYN? Cookies to calculate the SYN-ACK serial number (that is, SYN? Cookies), the host must first combine some local password bits, a data structure including IP address and TCP port number, SYN initial sequence number, and some index data identifying the password bits. An MD5 digest is generated on top of all the above bytes, and then some bits are truncated from the hash value to put it into the SYN-ACK sequence number. Since the size of the sequence number is about a quarter of the total hash value, this truncation is necessary, but usually at least 3 bytes of hash bits are used for verification, which means that there are still nearly 2 24 possibilities to guess and verify cookies without knowing the password bits. In order to send out the hash value, some bits of cookies will reduce the upper limit value of MSS (Maximum Segment Length) contained in SYN and affect the index bits that identify the native password bits in the hash value.