The Proto-Balto-Slavic language is not directly attested by any surviving texts but has been reconstructed using the comparative method. There are number of isoglosses that Baltic and Slavic languages share in phonology, morphology and accentology, which represent common innovation from Proto-Indo-European times, and which can be chronologically arranged.
Read more about Proto-Balto-Slavic Language: Phonology, Balto-Slavic Accentual System, Balto-Slavic Apophony
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