The numerous Cushite languages of East Africa make up another branch of Afroasiatic and can be separated for convenience into five subgroups—northern, central, eastern, western, and southern. […] The northern branch of Cushite consists of a number of closely related dialects of which Bedauye, the best known, may be taken as representative.
1990, [Joseph H. Greenberg], “Internal a- Plurals in Afroasiatic (Hamito-Semitic) (1955)”, in Keith Denning, Suzanne Kemmer, editors, On Language: Selected Writings of Joseph H. Greenberg, Stanford, CA: Stanford University Press, page 401