Chut language
Chứt 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:4 "bear".