the tangut 'grades' probably represented presence / absence of pharyngealization, as shown by evidence from rgyalrongic:https://www.academia.edu/36649771/Uvulars_and_uvularization_in_Tangut_phonology …
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if there are any ST languages with height-based vowel harmony in which the lower vowel is dominant (similar to chukchi)... retraction spreading seems like it could easily develop into such a system. might expand the search space a lil
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