of Proto-Tani vocabulary have no cognates within Sino-Tibetan (Post 2011), and most Tani grammar seems to be secondary, without cognates in grammatically conservative Sino-Tibetan languages such as Jingpho or the Kiranti languages (Post 2006). Post (2012) suggests that Apatani and Milang have non-Tani substrata, and that as early Tani languages had expanded deeper into Arunachal Pradesh, mixing with non-Tani languages occurred. Mark Post (2013) proposes the following revised classification for the Tani languages. Tani ?Milang Eastern Tani Bori Siang (Adi) Minyong Mising Pasi Padam Bokar Pre-Western Tani Tangam, Damu? Western Tani Apatani Subansiri Bangni-Tagin Nyishi–Hill Miri Galo Lare Pugo The undocumented Ashing language presumably belongs here. However, Macario (2015) notes that many Apatani words are closer to reconstructions of Proto-Tibeto-Burman (Matisoff 2003) than to Proto-Tani (Sun 1993). Possible explanations include Apatani having a substratum belonging to an extinct Tibeto-Burman branch or language phylum, or linguistic variation in Proto-Tani. Isoglosses Sun (1993: 254-255) lists the following 25 lexical isoglosses between Western Tani and Eastern Tani. Unified writing script A new alphabetical writing system for Tani languages was invented by Tony Koyu, a social scientist from Itanagar, Arunachal Pradesh. It was first presented at a seminar at the North Eastern Regional Institute of Science and Technology at Nirjuli, Arunachal Pradesh in November 2001. It is not related to any other writing system, but some of the letters are similar to Bengali or Latin letters. See also Siangic languages Greater Siangic languages Notes References Bradley, David, 1997. "Tibeto-Burman languages and classification." In David Bradley, ed. Tibeto-Burman languages of the Himalayas. Canberra, Australian National University Press: 1–72. . Blench, Roger (2014). Fallen leaves blow away: a neo-Hammarstromian approach to Sino-Tibetan classification. Presentation given at the University of New England, Armidale, 6 September 2014. James A. Matisoff, 2003. The Handbook of Proto-Tibeto-Burman: System and Philosophy of Sino-Tibetan Reconstruction. Berkeley, University of California Press. . van Driem, George, 2001. Languages of the Himalayas: An Ethnolinguistic Handbook of the Greater Himalayan Region. Brill. . Post, Mark, 2006. "Compounding and the structure of the Tani lexicon." Linguistics of the Tibeto-Burman Area 29 (1): 41–60. Post, Mark, 2011. "Isolate substrates, creolization and the internal diversity of Tibeto-Burman." Workshop on The Roots of Linguistic Diversity. The Cairns Institute, James Cook University, Australia, June 9–10. Post, Mark, 2012. "The language, culture, environment and origins of Proto-Tani speakers: What is knowable, and what is not (yet)." In T. Huber and S. Blackburn,