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In page Sudovian language:

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The language has six grammatical cases: nominative, vocative (The vocative example is "Kails naussen gnigethe." form the Sudovian Book), accusative, genitive, dative and locative, and a complex morphology with a variety of moods. It was a frontier dialect of Old Baltic, which preserved many archaic features which had been lost in the Middle Baltic group.[citation needed]