ABSTRACT
It does not appear to be possible to state the vowel mutations in Changed forms in a single synchronic rule, but three patterns of considerable generality can be identified. It is not clear, however, that these patterns correspond to phonological rules. It may, in fact, be more appropriate to view the relationship between Changed and Unchanged stems as one of non-phonological allomorphy. The recurrent patterns of mutation might then be stated as redundancy rules relating Changed and Unchanged stems which are represented with distinct underlying forms.
