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Efficient (but less readable) checking if Leap Year. sample: https://ellie-app.com/3qN2Njbf2VWa1, source: https://stackoverflow.com/a/11595914/966187
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| isLeapYear : Int -> Bool | |
| isLeapYear year = | |
| Bitwise.and year 3 == 0 && (not (modBy year 25 == 0) || Bitwise.and year 15 == 0) |
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