 (1) The multitude of forms in Ukrainian for the Common Slavic *sŭ(n) (*съ(н)) is a result of the fact that the initial "s" could assimilate (or dissimilate) with the root's initial consonants.As well, since a "ь" followed there was the potential for further sound changes.Finally, words entered Ukrainian from different Slavic languages with their own peculiarities or that the original origin of the word was lost.