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| | Indo-European_languages LANGUAGE SCHOOL EXPLORER |
 | | Balto-Slavic languages, believed by many Indo-Europeanists to derive from a common proto-language later than Proto-Indo-European, while others are skeptical and think that Baltic and Slavic are no more closely related than any other two branches of Indo-European. |
 | | Anatolian languages — earliest attested branch, from the 18th century BC; extinct, most notable was the language of the Hittites. |
 | | Some linguists propose that Indo-European languages are part of a hypothetical Nostratic language superfamily, and attempt to relate Indo-European to other language families, such as South Caucasian languages, Altaic languages, Uralic languages, Dravidian languages, Afro-Asiatic languages. |
| language.school-explorer.com /info/Indo-European_languages (1740 words) |
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