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Focus, feedback and fix it. All learning methods cannot be separated from "3F".嬴子夜前来是为了满足好奇心，能来这一趟还是很〖兴〗奋的，本来一切都好好的。　　一波未平，刑警队又接到报案：市郊的鱼塘边发现一名女性的尸体。经检验死者胃中有大量烈性安眠药，衣服上留有精斑。在死者的办公室刑警队发现了遗书，遗书中声称其是被顶头上司王处长多次奸污，才愤然走上轻生之路。经DAN对比，精斑为王处长所留，看来真相大白了，可是过于简单的案情上起了刑警队长郭子健的疑虑听得黄瓜和黄豆等人目瞪口呆。　　惠子和年轻有为的准外交官志摩信夫不由自主地相爱，却受到了重重阻挠，信夫的母亲是个傲慢的人，由于门第观念，她坚决不同意儿子和惠子交往，且经常从中作梗。惠子的生母为了维护自身名誉以及现任丈夫的事业，迟迟不认惠子，甚至在丈夫的逼迫下要求惠子和信夫分手，以成全丈夫与前妻所生的女儿。惠子的生父为了达到吞并别人的目的，不择手段，甚至连自己的女儿、妻子也成了竞争的工具，赌博的筹码……什么？站住？守卫一声大喝，拦住去路。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.