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>> No.12305807 [View]
File: 94 KB, 1082x1368, 1599606457019.png [View same] [iqdb] [saucenao] [google]
12305807

>>12303165
This. Also, the reason why adding up the digits to see divisibility by three is because of modulo congruences in z mod n z. Pic related.

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