Analysis of information sources in references of the Wikipedia article "Старослов'янська мова" in Ukrainian language version.
The language of the translations was based on Old Bulgarian and was certainly close to the Old Bulgarian dialect spoken in the native region of the missionaries. At the same time, the brothers [Cyril and Methodius] probably used elements, particularly lexical, from the regions where they were working. […] The Slavic language used in the translations was at the time intelligible to all Slavs.
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