172 Furthermore, for the two verbs here discussed the verbal inflections for 1+3 Simple tense and for 1+3 Remote Direct Knowledge (RDK) tense fall together, since root vowel length is indistinguishable from the vowel length mark of RDK, and geminate vowel length (vowel length longer than two vowels) does not occur. That is, the following forms do double duty for 1+3 in both the Simple and RDK tenses. ama:t"a ‘I wanted' p'a:t"a ‘I cooked' Another kind of vowel length in a root is that occurring with the verb sa.fia plus Simple tense in Jopo- queri (see Figure 6-11). This length results from a rule lengthening the root vowel to avoid an initial consonant cluster. In Sitajara one allomorph of the 1+3 Simple tense with sa.fia (the only irregular verb in Aymara) has a long vowel, although initial consonant clusters in Sa.fia are common in that dialect. 4-3.22.16 Three-vowel rule (Vowel deletion) 4-3.22.16.1 Nouns By a syntactically conditioned rule, noun roots having two vowels always keep the final vowel when serving as modifiers in noun phrases. (Nouns ending in a sequence of vowel-glide-vowel reduce it to long vowel; see 4-3.22.14.)