However, they are sometimes distributed across the stem: different parts of a stem may be constrained by the presence of a particular feature.
for example, the feature +ps (abbreviating [ps=True]) causes the gemination of the stem-initial consonant under various circum- stances and also controls the final vowel in the stem in the imperfective, and the feature +tr is marked by the vowel a before the first root consonant and, in the imperfective, by the nature of the vowel that follows the first root consonant (E where we would otherwise expect 1, 1 where we would otherwise expect E.) as with the verb affixes, there are long-distance dependencies within the verb stem.