523 In Salinas the following were given with the final suffix /-ru/, an allomorph of -iri on verbs ending in stem vowel /u/. ch'axch'u.ru ‘in order to water, person who waters' t"uqu.ru "in order to dance, dancer' In all Aymara dialects a final verb root vowel /u/ over- rides a following /i/ by regular morphophonemic rule, but it does not usually affect any subsequent /i/ as in this case; the word for 'dancer' in La Paz is t"ugu.ri. The rule in Salinas may reflect an earlier stage of vowel harmony in the language. 7-4.21.2 - fa All verb roots may take -fia to form an infini- tive (abstract noun of the action) which may or may not imply obligation. Most verb stems may also take -fia. Examples of verb roots and stems nominalized with -fia were given in 7-4.2. Some verb stems do not take -fia if the stem does not take a human subject. The following examples show some semantic constraints operating in La Paz: apa.fia ‘to take’ (human subject)