An example of phonemic sequences and changes are found not to be independent may be seen in the dynamic vowel processes of Yokuts. These are changes which occur in root morphemes when these roots are followed by suffixes. Each root may have one such vowel change when one suffix occurs after it, and another vowel change when another suffix occurs after it. The changes are thus independent of the roots. Each vowel change occurs with several suffixes, there being fewer different vowel changes than suffixes. However, each suffix occurs with only one vowel change, no matter what root precedes it.
- Harris (1951), Pag. 178