The present paper discusses the hypothesis according to which a devoicing sound shift*sb->sp-,*sd->st-,*sg->sk-took place in pre-Tibetan. I show that all examples supporting this putative sound shift have better explanations, and that this hypothesis creates more problems than it solves. In addition, I discuss data from modern Tibetic varieties, showing that no typological parallel for such a sound shift is attested.
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Guillaume Jacques (2020) studied this question.
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