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14 The Loc. Sing., when used, ends in -ī, as Karthāgĭn-ī at Carthage, rūr-ī in the country; but the Abl. is generally used instead.

Some Nouns with Nom. Sing, in -ĭs have -ī in the Abl. Sing. Ex. tussis (f.) cough, Abl. Sing. tuss-ī, also tuss-ĕ See § 272.

vīs (f.) force is declined thus:

A few other Nouns in -ĭs sometimes form the Ace. Sing. in -im. See § 271.

§ 22. The following list exhibits the most important forms of the Nom. and Gen, Sing, of Masculine and Feminine Nouns :