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In the classification of African languages, Volta–Congo is a hypothetical major branch of the Niger–Congo family. Comparative linguistic research by John M. Stewart in the sixties and seventies helped establish the genetic unity of Volta–Congo and shed light on its internal structure, but the results remain tentative. Williamson and Blench (2000) note that in many cases it is difficult to draw clear lines between the branches of Volta–Congo and suggest that this might indicate the diversification of a dialect continuum rather than a clear separation of families. This had been suggested before by Bennet (1983 as cited in Williamson and Blench 2000:17) in the case of the Gur and Adamawa–Ubangi languages, which apart from Ubangian are now linked together as Savannas. Other branches are Kru, Senufo, Kwa, and Benue–Congo, which includes the well-known and particularly numerous Bantu group. The relationship of Kwa to Benue–Congo (named ''Benue–Kwa''), and the eastern and western branches of Benue–Congo to each other, remain obscure. The vowel systems of Volta–Congo languages have been the subject of much historical comparative linguistic debate. Casali (1995) defends the hypothesis that the proto-Volta–Congo language originally had a nine- or ten-vowel system employing vowel harmony and that this set has been reduced to a seven vowel-system in many Volta–Congo languages. The Ghana–Togo Mountain languages are examples of languages where nine- or ten-vowel systems are still found. ==See also== * African languages * Language families and languages 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Volta–Congo languages」の詳細全文を読む スポンサード リンク
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