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identical with Proto-Dravidian itself. Proposed by Henry Heras in the 1950s, the hypothesis has gained some plausibility and is endorsed by Kamil Zvelebil, Asko Parpola and Iravatham Mahadevan. A 2021 research paper argues that Proto-Dravidian was spoken in the Indus Valley based on the Dravidian word for "tooth" (or "tusk"), as well as

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