Declension of the word "Alptraum"

Singular and plural for Alptraum, m, strong declension     translation to English nightmare, incubus, spectre

Singular
Plural
Singular
Nominativ (Wer? Was?)
der Alptraum
die Alpträume
Genitiv (Wessen?)
des Alptraumes / Alptraums
der Alpträume
Dativ (Wem?)
dem Alptraum / Alptraume
den Alpträumen
Akkusativ (Wen? Was?)
den Alptraum
die Alpträume
Plural
die Alpträume
der Alpträume
den Alpträumen
die Alpträume
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