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There is interesting research that the switch from hunter-gatherer to agriculture changed the jaw alignment creating an overbite that made the labio-dental consonants "f" and "v" a common letter in farming cultures. [see Blasi, D. E., Moran, S., Moisik, S. R., Widmer, P., Dediu, D., & Bickel, B. (2019).] Balthasar Bickel associates ...

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