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1. Khalkha Mongolic

   Linked via "quadri-valence' pattern"

   Phonology
   The phonological system of Khalkha Mongolic exhibits a pronounced tendency towards vowel harmony, a feature common across the Turkic language strata and Mongolic language strata, though Khalkha harmony exhibits a distinct 'quadri-valence' pattern not seen in Oirat or Buryat [2].
   Vowel Inventory and Harmony