The words of the third declension (-is, -ies) have either -ių or -ų in the genitive plural. The dative singular, similarly to the fifth declensional type, differs depending on the gender (-iai "f", -iui "m"), the instrumental singular, differently from the fifth type, is the same for the both genders. One noun of the third type, petys, peties, has the sg. nom. ending with a long i: -ys. Some of the words having the suffix -uonis (there are few of such words) have parallel forms in the other declensions: palikuonis, -ies ("common gender") and palikuonis, -io "m", palikuonė, -ės "f". Such change can happen after the change of an accent place: if the word is accented on the ending -is, then the change of declension (-is, -ies > -is, -io) does not occur in speech, and if the accent moves from the ending to the stem in singular nominative, then the change of declension sometimes occurs. For most of -uonis words, declining in the first declension is considered to be a mistake.