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Formula for number of days in each month
Author:
Michael Borcherds
http://cmcenroe.me/2014/12/05/days-in-month-formula.html
https://news.ycombinator.com/item?id=8705630
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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
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