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In page Code-switching:
"The earliest known use of the term "code-switching" was published in 1951 by Lucy Shepard Freeland in Languages of the Sierra Miwok[1][2], and more widely recognized by Roman Jakobson in Results Conf. Anthropologists & Linguists in 1953.[3][4] Written with C. F. Voegelin, T. A. Sebeok, and C. Lévi-Strauss, Jakobson attributes the idea to linguist William Freeman Twaddell, inspired by "communication engineers".[citation needed]
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