Comments:АПиПЯЯ 283. The comparison of PT *čok with Sino-Kor. čjok (SKE 39, AKE 7, EAS 63) should be, of course, rejected; on the other hand, the comparison of Kor. čhă- (a regular reduction < *čăhă-) with Mong. čad-, čas- in SKE 46 cannot explain the aspiration of č- in Korean. See further МССНЯ, 331.