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What are the last four digits of huangqiao town's ID card in Dongkou County, Shaoyang City, Hunan Province?
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The ID number consists of 18 digits. The last four digits of the ID card are 15, 16, 17 and 18, which have different functions and meanings. The 15th and 16th digits represent the code of the police station where the holder is located, and the 17th digit represents the gender of the holder, with the singular number being male and the even number being female. The eighteenth bit is the check code, which is calculated by the formula of the numbering unit.