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In page Coptic language:

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The Bohairic (also known as Memphitic)[citation needed] dialect originated in the western Nile Delta. The earliest Bohairic manuscripts date to the 4th century, but most texts come from the 9th century and later; this may be due to poor preservation conditions for texts in the humid regions of northern Egypt. It shows several conservative features in lexicon and phonology not found in other dialects. Bohairic is the dialect used today as the liturgical language of the Coptic Orthodox Church, replacing Sahidic some time in the eleventh century. In contemporary liturgical use, there are two traditions of pronunciation, arising from successive reforms in the 19th and 20th centuries (see Coptic pronunciation reform). Modern revitalisation efforts are based on this dialect.