highvalyrian1-4  Exercise 3: Mergers
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Identical plural forms: genitive, dative and locative are all valoti.
Identical in the paucal and the collective: the instrumental and the
vocative (valussa in the paucal, valarza in the collective).

Why it still works: the sentence around the noun (the verb, the other
nouns, a postposition or preposition) shows which case is meant, and
the cases that merge are ones that rarely compete for the same job.