ANSWERS: 2
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Same reason I wear a pair of glasses. A pair of eyeglasses is literally a pair of glasses. A pair of scissors is a pair of knives. A pair of pants is a pair of pantaloon leggings. (We don't call briefs, boxer shorts, or undershirts of any kind a pair of underwear so I don't know what you're talking about in that regard.)
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They all have two of something. two blades for scissors, two legs/holes for legs in others. Mind you, we only refer to wearing one bra, so the theory doesn't really work there.
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