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Tongwe (Sitongwe) and Bende (Sibende) constitute a clade of Bantu languages coded Zone F.10 in Guthrie's classification. According to Nurse & Philippson (2003), they form a valid node. Indeed, at 90% lexical similarity they may be dialects of a single language.
^ Abe, Yuko (2006). "A Bende Vocabulary". Bantu Vocabulary Series (13). Research Institute for Languages and Cultures of Asia and Africa (ILCAA), Tokyo University of Foreign Studies.