Comment: Cf. also Lezg. Khl. c̣ɨ-d, Ag. Bursh. jic̣u-r. Some forms (especially Rut. and Bud.) rather go back to PL *jic̣ɨ- (with another class prefix); some forms can go back to both *u_ic̣ɨ- and *jic̣ɨ- (with neutralisation of *u_- and *j- before *-i-).
PL *u_ic̣ɨ- has lost the Inlaut resonant *-n-, possibly under the influence of *u_ilč̣ʷɨ- 'nine'. The original form *uinc̣ɨ-, however, is reflected in the Archi form moc̣o-r - a modification of the numeral 'ten' used in compounds (moc̣or s:ejṭu 'eleven', moc̣or q̇Iʷeṭu 'twelve' etc.).