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&Nbsp; according to the national standard of the people's Republic of China (GB 11643-1999) on citizenship number, citizenship number is a feature combination code with 18 digits, which is composed of 17 digit body code and one digit check code. The sequence from left to right is: six digit address code, eight digit date of birth code, three digit sequence code and one digit check code. The address code represents the administrative division code of the county (city, banner, district) where the coding object's permanent residence is located. The birthday code represents the year, month and day of the birth of the coding object. The year is represented by four digits, and there is no separator between the year, month and day. Sequence code refers to the sequence number of persons born in the same year, month and day within the area marked by the same address code. The odd number of the sequence code is given to men and the even number to women.
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