A Leap Year is determined if the 4-digit year can be divided by 4 UNLESS
The year can be divided by 100, then it is not a Leap year, UNLESS
The year can be divided by 400, then it is a Leap Year, UNLESS
The year can be divided by 4000, then it is not a Leap year, UNLESS
The year is 200 or 600 years after a year that is divisible by 900, then it is a
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