The data packet increased checking parity can ensure data consistency in transmission, to remove and recover a reservedkeyword of data though the positive replacement and reverse replacement.
增加数据包校验位，保证数据传输的一致性；通过正向替换和逆向替换消除并恢复数据中存在的保留关键字；
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Lcomm keyword, which is then followed by a comma and then the amount of space to be reserved.