Chut language
Encyclopedia
Chut or Ruc-Sach is a dialect cluster spoken by the Chut people
Chut people
The Chut are a small ethnic group located in the Minh Hóa and Tuyên Hóa districts of Quảng Bình Province, in Vietnam's North Central Coast. There are multiple sub-ethnic groups within the Chut designation including the Rục, Mày, Arem, Mã Liêng, and Sách...

 of Vietnam, with a smaller population of some 450 speakers in neighbouring Laos
Laos
Laos Lao: ສາທາລະນະລັດ ປະຊາທິປະໄຕ ປະຊາຊົນລາວ Sathalanalat Paxathipatai Paxaxon Lao, officially the Lao People's Democratic Republic, is a landlocked country in Southeast Asia, bordered by Burma and China to the northwest, Vietnam to the east, Cambodia to the south and Thailand to the west...

 (in Khammouane Province). It may be most closely related to Arem
Arem language
Arem is an endangered language spoken in a small area on either side of the Laos-Vietnam border. In 1996 there were estimated to be about twenty speakers in each country. It is therefore on the verge of extinction. Its nearest relative may be the Chut language of Vietnam.Arem lacks the breathy...

.

Chut has the four-way register
Register (phonology)
In linguistics, a register language, also known as a pitch-register language, is a language which combines tone and vowel phonation into a single phonological system. Burmese and the Chinese dialect Shanghainese are examples...

 system of Thavung augmented with pitch
Tone (linguistics)
Tone is the use of pitch in language to distinguish lexical or grammatical meaning—that is, to distinguish or inflect words. All verbal languages use pitch to express emotional and other paralinguistic information, and to convey emphasis, contrast, and other such features in what is called...

.http://sealang.net/mk/vietic.htm
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