The Bohairic (also known as Memphitic) 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. Fayyumic (also written as Faiyumic; in older works it is often called Bashmuric) was spoken primarily in the Faiyum west of the Nile Valley. It is attested from the 3rd to the 10th centuries. It is most notable for writing (which corresponds to ), where other dialects generally use (probably corresponding to a flap ). In earlier stages of Egyptian, the liquids were not distinguished in writing until the New Kingdom, when Late Egyptian became the administrative language. Late Egyptian orthography utilised a grapheme that combined the graphemes for and in order to express . Demotic for its part indicated using a diacritic variety of . Oxyrhynchite (also known as Mesokemic or [confusingly] Middle Egyptian) is the dialect of Oxyrhynchus and surrounding areas. It shows similarities with Fayyumic and is attested in manuscripts from the fourth and fifth centuries.