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Wikipedia definition
1. 9999 (number)Nine thousand nine-hundred ninety-nine (9999) is the natural number following 9998 and preceding 10000. 9999 can be used as a divisor to generate 4-digit decimal recurrences. For example, 1234 / 9999 = 0.123412341234... . 9999 is an auspicious number in Chinese folklore. The original layout for the Forbidden City had 9999 rooms.
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