We don’t exclude the possibility of contacts between the ancient Indo-Europeans and their Caucasian contemporaries, but no precise trace has so far b… - André Martinet

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We don’t exclude the possibility of contacts between the ancient Indo-Europeans and their Caucasian contemporaries, but no precise trace has so far been brought forward. The structural similarities that one may envision for a very distant period would not imply a common origin nor a period of symbiosis.