Chut language
Chứt (Chut, Cheut) or Rục-Sách is a dialect cluster spoken by the Chứt people of Vietnam, with a smaller population of some 450 speakers in neighbouring Khammouane Province, Laos. It is a Vietic language that may be most closely related to Arem. Chứt has the four-way register system like Thavung augmented with pitch. Unlike the Vietnamese language, Chứt still allows presyllables with a minor vowel, such as "caku:" "bear" (cf. Vietnamese "gấu").