Present-day Southeastern Yiddish (sey) is a relatively young dialect, probably formed after the Khmelnytskyy massacres of 1648. Was the primary force in its historical phonology the influence of coterritorial languages, of other dialects, or internal factors? How important was the role of homonymy and the functional load of specific phonemes? Internal factors that may have had the greatest influence on the development of sey are best sought in the transitional dialects on the fringes of sey.
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