All the vowels in a noncompound word, including all its suffixes, must belong to the same group. If the first vowel is −ATR, then every vowel of the word must be either or a −ATR vowel. Likewise, if the first vowel is a +ATR vowel, then every vowel of the word must be either or a +ATR vowel. In the case of suffixes, which must change their vowels to conform to different words, two patterns predominate. Some suffixes contain an archiphoneme that can be realized as . For example: