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There is a medical concept that every fetus begins as a female and then as it develops the chromosome changes from XX to XY. It's not really a mutation. That's just a joke. It's not 100% proven; as I said, it's just one of the plethora of medical theories floating around the world.
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By the time you're twenty-five they will say you've gone and blown it. By the time you're thirty-five I must confide you will have blown them all
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