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{{short description|Computation modulo a fixed integer}}
{{About|the concept that uses the "''{{mvar|a}}
[[File:Clock group.svg|thumb|upright=1.1|right|Time-keeping on this clock uses arithmetic modulo 12. Adding 4 hours to 9 o'clock gives 1 o'clock, since 13 is congruent to 1 modulo 12.]]
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