680 often fail to keep them apart or use cumbersome means to do so, as in the case of the velar fricative written j and the postvelar fricative written jj. When these cluster, as frequently happens, unwieldy and ambiguous sequences like jjj or jjjj can result whose disambiguation requires the use of hyphens, as in the following example from Herrero et al. (1971: 1969): paj-jjeta ‘pay me'. In the Yapita phonemic alphabet this word would be unambiguously rendered as pajxita. 9-3 Morphophonemics Missionary, Patrén, and Radio Aymara observe regular vowel-dropping and -retaining rules as do other dialects, except that stylistically-conditioned final vowel dropping occurs less often in Missionary and Patron Aymara than in other dialects. Stem-final vowel restora- tion with stress thereby occurring on the antepenultimate vowel (see 4-3.33) occurs frequently on verbs, usually with the Imperative 2+3 suffix, in radio advertisements or announcements urging listeners to buy something or be present at an event, as in the following examples: al.t'a.si.pini.ma 'be sure to buy' buy 2>3 I yati.ya.si.p.ka.rak.tama ‘they are notifying you' notify 32 S