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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.上世纪七十年代，老北京胡同里住着三个孩子，王大卫、李红兵、苏茉莉，三人青梅竹马，一起从小玩到大。王大卫（黄渤饰）祖上是宫廷的御厨，公私合营后父亲在国营饭店掌厨，一身的绝学最终遗憾地带到另一个世界。大卫子承父业进入饭店，却因做了一个糟糕的蛋炒饭只能干些打扫的工作。时代沧桑巨变，社会越来越开放，人们都在这浮躁的气息中寻找明天的出路。红兵和茉莉相恋，最终却分手外出闯荡世界；怀有身孕的茉莉终究不愿接受爱恋自己的大卫，转而南下追寻心中的明星梦。借着新政策之力，大卫承包了国营饭店，开始干出一番事业。时光流转，旧日的好友你来我往，从不驻留，用各自或明或闇、光怪陆离的人生装点着这飞速变幻的离奇世界……人总是等到失去后才知道珍惜，如果可以从头来过，是否就可以弥补缺憾，达成心愿？Creates an object from its specific subclass. Q: How can it be realized? Answer: To create abstract classes derived from factories, that is, specific factories create specific products. Since products are to be created, product abstract classes and specific product classes are naturally needed.Deep replication: After an object is replicated, both the basic data type and the reference type are recreated. In short, the deep copy has been completely and completely copied, while the shallow copy is not completely copied.Let the winners of team a and team b play against team c五个在美甲店工作的女性除了美甲与修甲以外，还进行一系列犯罪活动。