Thirty days hath September, April, June, and November; all the rest have thirty-one. Excepting February alone, which hath but twenty-eight, in fine. Till leap year gives it twenty-nine.

 

Mnemonic Device:

Thirty days hath September, April, June, and November; all the rest have thirty-one. Excepting February alone, which hath but twenty-eight, in fine. Till leap year gives it twenty-nine.

Explanation: how many days in each month?

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