 There are also cases of vowel alternation in morphemes (e.g.the first-person subject prefix may appear as "n-, ni-" or "na-") and lexical stems (thus the stem "stay" may appear in the forms "aakir-i" "stays" and "aaikur-u" "stayed", where the short stem vowel copies the vowel of the suffix).Consonants display a degree of sandhi-type alternation, as seen for example in the final consonant of the same stem "stay, be", cf.