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Three days later, math
3+ 1 = 4 days 4+ 1 = 5 days 6+ 1 = 7 days.

[4,5,7] = 4× 5× 7 = 140 days ... The least common multiple is140 days.

September 10+ 140 days = the following year 1 28th of the month ... three people took another day off at the same time.

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