142 Calacoa). Additional dialect groupings on the basis of patterning of phonological correspondences are given in the conclusions to Chapters 5, 6, and 7 and in Chapter 10. Other phonological variation that occurs in Aymara is attributable to dialect-specific morphophonemic rules affecting the phonetic realizations of phonemes (for example voicing of stops) or causing phoneme shifts or deletions. These are discussed in Chapter 4.