what are periods???....... ............. . .
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Periods are the horizontal rows in the Morden periodic table....
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Periods is a flow of blood after a girl attains an age of 12 or 13 and stops at an age of 45 or 50, which is called menopause. Periods is also called menstruation. Menstruation happens once in a month. It is for periods blood flow in girls regulate.
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