▁never ▁appears ▁at ▁the ▁beginning ▁of ▁a ▁word . ▁W ords ▁beginning ▁with ▁ya -, ▁yo - ▁and ▁y u - / y ū - / y <0xCA> <0x8F> - ▁are ▁written ▁as ▁я -, ▁ ё - ▁and ▁ю -, ▁and ▁the ▁combinations ▁are ▁written ▁in ▁the ▁middle ▁of ▁the ▁word : ▁vi yó ra ▁is ▁ви ё ра ▁. ▁ ▁Use ▁of ▁ <0xD3> <0xA3> ▁and ▁ <0xD3> <0xAF> ▁is ▁uncertain , ▁but ▁they ▁seem ▁to ▁distinguish ▁two ▁similar - s ounding ▁words : ▁ ▁and ▁, ▁ ▁and ▁. ▁Perhaps ▁ <0xD3> <0xA3> ▁is ▁also ▁used ▁as ▁a ▁stress ▁marker ▁as ▁it ▁is ▁also ▁in ▁T aj ik , ▁and ▁ <0xD3> <0xAF> ▁can ▁also ▁be ▁used ▁in ▁T aj ik ▁loan words ▁to ▁indicate ▁a ▁T aj ik ▁v owel ▁ ▁, ▁but ▁it ▁can ▁have ▁some ▁other ▁unknown ▁use . ▁ ▁In ▁older ▁texts , ▁the ▁alphabet ▁did ▁not ▁use ▁letters ▁ Ъ ▁ ъ ▁and ▁Э ▁э . ▁Instead ▁of ▁T aj ik ▁ ъ , ▁Y ag hn obi ▁’ ▁and ▁е ▁covered ▁both ▁T aj ik ▁е ▁and ▁э ▁for ▁. ▁Later , ▁the ▁letters ▁were ▁integrated ▁into ▁the ▁alphabet ▁so ▁the ▁older ▁ ▁was ▁changed ▁into ▁ ▁to ▁represent ▁the ▁pron unci ation ▁ ▁( and ▁not ▁). ▁Old er ▁ ▁was ▁changed ▁to ▁ ▁. ▁▁ ▁and ▁ ▁are ▁written ▁е ▁and ▁и . ▁Y ag hn obi ▁ ▁и ▁can ▁be ▁ ▁after ▁a ▁v owel ▁like ▁in ▁T aj ik ,