199 Notes Tan optional rule is one whose constraints are not yet fully understood. Many are probably stylistically conditioned. 2The geminate vowel cluster /aa/ resulting from loss of /j/ reduces to /a/; see 4-3.22.12. 3The final vowel of jich"a drops by a vowel sequence avoidance rule; see 4-3.22.13. “The first vowel of mama drops by the three-vowel rule; see 4-3.22.16. This example shows that initial consonant clusters are permitted in La Paz/Compi dialect in nouns. They are usually avoided in verbs; see 4-3.13. Geminate /a/ here results in /a:/. 6py a regular morphophonemic rule (see 4-3.22.22) /j/ or /x/ tends to reduce to aspiration following the homorganic stop. In the nonhomorganic combination /kx/ the velar /k/ tends to assimilate to the following post- velar /x/, resulting in /q"/. According to Hardman (personal communication) voicing and and frication of stops are common in Andean languages, especially in Quechua. Place names often re- flect this, e. g. Cochabamba. Bin the derivations of kawk.i:ri and k"ur.i:ri the following intervening forms may be postulated since vowel length verbalization requires a preceding vowel while -iri requires a preceding consonant or, as in these cases, reduces a preceding long vowel to one vowel. With morpheme divisions: *kawkiiiri > (Ckawkiiri] /kawki:ri/ kawk.i:ri *k"uriiiri > (Ck"uriiri] /k"uri:ri/ 9 k"ur.i:ri