▁Y ag hn obi - spe akers ▁for ▁business ▁and ▁formal ▁transactions . ▁A ▁single ▁Russian ▁eth n ograph er ▁was ▁told ▁by ▁nearby ▁T aj iks , ▁long ▁host ile ▁to ▁the ▁Y ag hn ob is , ▁who ▁were ▁late ▁to ▁adopt ▁Islam , ▁that ▁the ▁Y ag hn ob is ▁used ▁their ▁language ▁as ▁a ▁" secret " ▁mode ▁of ▁communication ▁to ▁conf use ▁the ▁T aj iks . ▁The ▁account ▁led ▁to ▁the ▁belief ▁by ▁some , ▁especially ▁those ▁reli ant ▁sole ly ▁on ▁Russian ▁sources , ▁that ▁Y ag hn obi ▁or ▁some ▁derivative ▁of ▁it ▁was ▁used ▁as ▁a ▁code ▁for ▁ne f ari ous ▁purposes . ▁ ▁There ▁are ▁two ▁main ▁dialect s : ▁a ▁western ▁and ▁an ▁eastern ▁one . ▁They ▁differ ▁primarily ▁in ▁ph on et ics . ▁For ▁example , ▁historical ▁* θ ▁corresponds ▁to ▁t ▁in ▁the ▁western ▁dialect s ▁and ▁s ▁in ▁the ▁eastern : ▁met ▁– ▁mes ▁' day ' ▁from ▁S og d ian ▁m ē θ ▁. ▁Western ▁ay ▁corresponds ▁to ▁Eastern ▁e : ▁way š ▁– ▁we š ▁' gr ass ' ▁from ▁S og d ian ▁way š ▁or ▁w ē š ▁. ▁The ▁early ▁S og d ian ▁group ▁ θ r ▁( l ater ▁ ṣ ̌ ) ▁is ▁reflected ▁as ▁sar ▁in ▁the ▁east ▁but ▁tir ▁in ▁the ▁west : ▁s ará y ▁– ▁tir á y ▁' three ' ▁from ▁S og d ian ▁ θ r ē / θ ray ▁or