 Complete the following phrase:  There are many inscriptions engraved on the walls  2 in the Greek alphabet, 2 in the Old Slavonic language Bulgarian recension using the Glagolitic script and over 30 using the Cyrillic script. The most numerous are the runic inscriptions of Turkic type  over 60 have been found so far. The same type of runes have been used on the Pliska Rosette and can be found on building materials and on the 9th century walls of the first Bulgarian capital Pliska. The Turkic runes in Murfatlar were based probably on the Kharosthi script. The language of the runes is presumably Bulgar, as suggested by some scholars. According to Romanian researchers, some graffiti, including a Viking navy, were interpreted as Varangian. However, they could have been carved by the local monks during the 