The Dene-Caucasian (or Sino-Caucasian) language family is a conjectural macrofamily containing the Sino-Tibetan, North Caucasian, and Na-Dene languages. The theory, first scientifically demonstrated in the 1980's by Sergei Starostin, is based in large part on the work of Alfredo Trombetti, Karl Bouda, and Edward Sapir. Many linguists, in particular John Bengtson, have proposed including Basque as well. However, due to the uncertainty of comparative linguistics, this has never been demonstrated unequivocally.
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