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Some rules concerning vowels in Chadic

The purpose of this paper is to show that one of the characteristics of the Chadic languages is the existence of two types of phonological rules affecting vowels. One type of rule operates on the vowels of the stem when a suffix is added and another type of rule operates on the vowel of the suffix itself. The latter type is triggered by the syllabic structure and/or the height of the vowels of the stem.