chapter  12
Monosyllabic verb stems and the stem augment ku-
Pages 7

In addition, the segment ku-is retained in the simple imperative form of monosyllabic verbs, as in (3a, 4a), but omitted in the presence of a prefixed object pronoun, as in (3b, 4b) (see Table 11.3 for a special form of imperative used for kuja “to come”).