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Which of these years was not a leap year in the Gregorian calendar?
Why do we need to add an extra day in a leap year in the Gregorian calendar?
How many leap years are there from the year 2001 to the year 2100 (both included)?
In the Gregorian calendar, how many days are there in a block of 400 consecutive years (for example, 2001 to 2400)? Use the leap-year rule.
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