Declension of the word "Altertum"

Singular and plural for Altertum, n, strong declension     translation to English antiquity, ancient times

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Altertum
die Altertümer
Genitiv (Wessen?)
des Altertums
der Altertümer
Dativ (Wem?)
dem Altertum
den Altertümern
Akkusativ (Wen? Was?)
das Altertum
die Altertümer
Plural
die Altertümer
der Altertümer
den Altertümern
die Altertümer
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