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| def leap_year?(year) | |
| if !year.is_a?(Integer) | |
| return false | |
| end | |
| if year % 4 == 0 | |
| if year % 100 == 0 | |
| if year % 400 == 0 | |
| return true | |
| else | |
| return false | |
| end | |
| else | |
| return true | |
| end | |
| else | |
| return false | |
| end | |
| end |
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