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In page Oscan language:

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In coastal zones of Southern Italy, Oscan is thought to have survived 3 centuries of bilingualism with Greek between 400 and 100 BCE, making it "an unusual case of stable societal bilingualism" wherein neither language became dominant or caused the death of the other; however, over the course of the Roman period both Oscan and Greek would be progressively effaced from Southern Italy, excepting the controversial possibility of Griko representing a continuation of ancient dialects of Greek.[1]