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63.

In Neuter nouns with liquid or nasal stems the Nominative is the same as the stem.

Exceptions: 1. Stems in in- have e instead of i in the nominative: as in nómen, stem nómin-.

2. Most stems in er- and or- have -us in the nominative: as, genus, stem gener-.[1][These were originally s-stems (cf. § 15. 4).]