"A pronoun, too, will aptly reflect the number of its antecedent: "they" does not refer to one person, no matter how many personalities she or he has, or how eager you are to skirt the gender frays."

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You may batter your way through the thick of the fray, You may sweat, you may swear, you may grunt; You may be a jack-fool, if you must, but this rule Should ever be kept at the front;-- Don't fight with your pillow, but lay down your head And kick every worriment out of the bed.

— Edmund Vance Cooke