The other dialects group as Niesu (聂苏, and Adu) and as Nuosu proper (Muhisu 米西苏, Yinuo 义诺, and Shengzha 圣乍). Niesu has both lost voiceless nasals and developed diphthongs. Adu (阿都话), characterized by its labial–velar consonants, is spoken in the Butuo and Ningnan counties of Liangshan Yi Autonomous Prefecture, Sichuan province, and also in parts of Puge, Zhaojue, Dechang, and Jinyang counties. Nyisu or Yellow Yi (黄彝) of Fumin County, Yunnan may either be a Suondi Yi (Nuosu) dialect or Nisu dialect. Zhu and Zhang (2005) reports that the Shuitian people () reside mostly in the lowlands of the Anning River drainage basin, in Xichang, Xide, and Mianning counties of Liangshan Prefecture in Sichuan. They are called Muhisu (mu33 hi44 su33) by the neighboring Yi highland people. Shuitian is spoken in the following locations. Shuitian belongs to the Shengzha dialect () of Northern Yi. Mianning County: Jionglong 迥龙, Lugu 泸沽, Hebian 河边; Manshuiwan 漫水湾 Xichang: Lizhou 礼州, Yuehua 月华 Xide County: Mianshan 冕山镇 (including Shitoushan Village 石头山村), Lake 拉克 Bradley (1997) According to Bradley (1997), there are three main dialects of Nosu, of which the Southeastern one (Sondi) is most divergent. Northern Tianba 田坝 Northwestern Yinuo 义诺 a.k.a. Northeastern Central (Shengzha 圣乍) Southeastern (Sondi) Sondi Adur Chen (2010) Chen (2010) lists the following dialects of Nosu. Also listed are the counties where each respective dialect is spoken. Nosu 诺苏方言 Senza, Shèngzhà 圣乍次方言 Senza, Shèngzhà 圣乍 (): 1,200,000 speakers primarily in Xide, Yuexi, Ganluo, Jinyang, Puge, Leibo, Xichang, Dechang, Mianning, Yanyuan, Yanbian, Muli, Shimian, Jiulong, and Luding; also in Huaping, Yongsheng, Ninglang, Lijiang, Jianchuan, Yongshan, and Qiaojia Yino, Yìnuò 义诺 (): 600,000 speakers primarily in Meigu, Mabian, Leibo, and Ebian, Ganluo; also in Yuexi, Zhaojue, and Jinyang Lidim, Tiánbà 田坝 (): 100,000 speakers primarily in Ganluo, Yuexi, and Ebian; also in Hanyuan Sodi, Suǒdì 所地次方言 (): 600,000 speakers primarily in Tuoxian, Huili, Huidong, Ningnan, Miyi, Dechang, and Puge Writing system Classic Yi is a syllabic logographic system of 8,000–10,000 glyphs. Although similar to Chinese characters in function, the glyphs are independent in form, with little to suggest a direct relation. In 1958 the Chinese government had introduced a Roman-based alphabet based on the romanized script of Gladstone Porteous of Sayingpan. This was later replaced by the Modern Yi script. The Modern Yi script ( 'Nosu script') is a standardized syllabary derived from the classic script in 1974. It was made the