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'Proto-Balto-Slavic' is the hypothetical language from which the Proto-Baltic language and the Proto-Slavic language hypothetically developed.
Thus, all Baltic languages and Slavic languages hypothetically developed from Proto-Balto-Slavic.
Thracian is also sometimes theorized to be related, as part of the Thraco-Balto-Slavic group (see Classification of Thracian).