Nasu language

Nasu (Naisu, Eastern Yi), or Nasu proper, is a Loloish language spoken by a quarter million Yi people of China. Nasu proper and Wusa Nasu are two of six Yi languages recognized by the government of China. Unlike most written Yi languages, Nasu proper uses the Pollard (Miao) script. A distinct form of the Yi script was traditionally used for Wusa, though few can still read it.
Names.
According to the "Guizhou Ethnic Gazetteer" (2002), Yi autonyms include Nasu 哪苏, Tusu 兔苏, Lagou 腊勾, Guo 果, and so forth.
Most of Yi people of the Luquan area do not have the autonym Luoluo and Nasu (transliterated into Chinese as 纳苏) means "black", hence the Black Yi (黑彝 Hei Yi), though Black Yi is an aristocratic caste distinction among the Yi People, and Black Yi Script (Heiyiwen) was a Latin script for Yi introduced by missionaries.
Classification.
Chen (1985).
Chen, et al. (1985:108) recognizes 3 major varieties of "Eastern Yi" (i.e., Nasu) that are spoken in Yunnan and Guizhou provinces, namely "Dianqian" 滇黔 (Yunnan-Guizhou), "Pan" 盘县 (Pan County of Guizhou), and "Diandongbei" 滇东北 (Northeastern Yunnan). Autonyms include ' (alternatively '), ' (including ', ', and '), ', and '.
Huang (1993).
In his description of the Yi script (not the spoken language) Huáng Jiànmíng (1993) holds that the Nasu variety of Yi script is used by the groups speaking languages of the Nasu language cluster of Northern Yi in south-eastern Sìchuān, eastern Yúnnán, Gùizhōu, as well as in Guǎngxī. He distinguishes two sub-groups. Nasu proper used in Wuding, Luquan and the suburbs of Kunming, and Wusa used in Guizhou and the bordering areas of Eastern Yunnan.
Bradley (1997).
David Bradley (1997) distinguishes three main dialects of Nasu:
Lama (2012).
Lama (2012) determined that Nasu (Western) is more closely related to Gepo than it is to the others:
Phonology.
Tones.
3 tones occur as follows: