Pretty much every Chinese person has a government-issued ID card (身份证). They serve the roles of American social security cards (and sometimes driver’s licenses, for non-driving-related ID purposes). These ID cards are necessary for all kinds of everyday procedures and thus indispensible in daily Chinese life, although in some cases the ID number on the card is all that is needed.
Recently I became interested in the structure of the ID numbers on these cards. I was trying …

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