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					Originally Posted by 1010011010
					
				 It's a replacement for cumbersome constructions ("he or she", "himself or herself") to refer to a single hypothetical person of any gender.   "They" and "themselves" aren't plurals in this usage.... though you still treat them that way.   
 Ain't languages a beautiful thing?
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 That's why I hate English class... But you're right (in my mind), making a valid point is more important than a minor mechanical error.