Sak is a Tibeto-Burman language of Burma and China. The various varieties are generally considered separate Sak or Luish languages, though the ISO coding is confused: Ethnologue lists the varieties of Kado as Settaw, Mawkhwin, and Nanza (Kanan), then states that the Kadu, Kanan, Chakpa, and Phayeng dialects may be separate languages.