Bantawa is a member of the Easter Kiranti branch of Tibeto-Burman langauges spoken by the Bantawa Rai people in parts of Sikkim and Nepal. An estimiated 390,000 people speak this language, and in Sikkim it is sometimes written with an alphabet known as Kirat Rai.
Information about the Bantawa language and the Kirat Rai script and people
http://robbie.eugraph.com/bantawa/report.html
http://anshumanpandey.blogspot.com/2011/04/kirat-rai-script.html
http://std.dkuug.dk/jtc1/sc2/wg2/docs/n4037.pdf
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