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According to the book "Facts and Fallacies" published by Reader's Digest and available at finer thrift stores for a dollar, the word "girl" originally referred to children of either gender. If a gender distinction were needed, the choice was between a gay girl or a knave girl. This was due to the obvious observation that, prior to puberty, progeny are all very feminine, with their high pitched voices and lack of body hair. This poor knave will be in for a rude awakening when his balls drop and he is forced to be "trade" to keep up with his inversion.
Just kidding. There is no class on this site.