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BG-JBMO-TST 2017 Problem 3

    Given are sheets and the numbers 00,01,…,9900, 01, \ldots, 99 are written on them. We must put them in boxes 000,001,…,999000, 001, \ldots, 999 so that the number on the sheet is the number on the box with one digit erased. What is the minimum number of boxes we need in order to put all the sheets?

    Dataset text AI-MO AoPS. Quoted with source.

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