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In page Ukrainian language:

"

The Old East Slavic and Russian o in syllables ending in a consonant, often correspond to a Ukrainian i, as in podpid (під, 'under'). Thus, in the declension of nouns, the o can re-appear when it is no longer located in a closed syllable, such as rik (рік, 'year') (nom): rotsi (loc) (році). Similarly, some words can have і in some cases when most of the cases have o, for example слово (nominative singular), слова (nominative plural) but слiв (genitive plural).[citation needed]