196 certain conditions; geminate consonant reduction; neutrali- zation of stop-fricative clusters and aspirated stops; syntactical word-final vowel devoicing and deletion. 4-4.22 Dialect-specific rules 4-4.22.1 Obligatory rules Obligatory dialect-specific rules are voicing of prevocalic stops after homorganic nasals and the palatal lateral within a morpheme, Salinas; frication of velar stop before consonant in certain morphemes, Salinas; ‘reduction of clusters of alveolar fricative plus velar fricative, Salinas; affricate reduction to /s/ after /x/, Jopoqueri; loss of morphological word-final vowel on verb subjects in certain environments in certain dialects; avoidance of morphological word-final consonant clusters on nouns with personal possessive suffixes, Morocomarca. 4-4.22.2 Optional rules Optional dialect-specific rules are preposition (or recovery) of initial /ji/ or /si/ on sa.fia before Simple tense inflection, La Paz, Juli, Huancané, Socca; reduction of /q'/ to ['], Salinas, Calacala, and Moroco- marca; palatalized velar allophone of /fi/, Morocomarca; voicing of stop after homorganic nasal and before vowel, Calacala, Corque, Huancané, Sitajara; voicing and frica- tion of prevocalic /p/ in -pa 3p suffix, Calacala;