Usage examples for both
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They both of them did as they were told, and they had to do it." – The Box with the Broken Seals by E. Phillips Oppenheim
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I am afraid, really afraid it will have to be both. – A Man's Hearth by Eleanor M. Ingram
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Call your girl there, and come out both of you as soon as possible!" – The Allis Family; or, Scenes of Western Life by American Sunday School Union