Comment: 4th class in all class-distinguishing languages. In Arch. cf. the conjunctive form č̣at:-u (for demonstrating tense -t: < *-l:). The obl. base can be reconstructed as *č̣ol:a- (cf. Rut. č̣ílɨ-, Kryz. č̣il-; with vowel levelling - Lezg. č̣ala-, Ag. č̣ala(j)-).
