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in the PONS Dictionary

trī-duum <ī> nt (dies)

Declension of trī-duum
Case Singular Plural
Nominative trī-duum trī-dua
Genitive trī-duī trī-duōrum
Dative trī-duō trī-duīs
Accusative trī-duum trī-dua
Ablative trī-duō trī-duīs
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