Declension of the word "heizkeller"

Singular and plural for Heizkeller, m, strong declension     

Singular
Plural
Singular
Nominativ (Wer? Was?)
der Heizkeller
die Heizkeller
Genitiv (Wessen?)
des Heizkellers
der Heizkeller
Dativ (Wem?)
dem Heizkeller
den Heizkellern
Akkusativ (Wen? Was?)
den Heizkeller
die Heizkeller
Plural
die Heizkeller
der Heizkeller
den Heizkellern
die Heizkeller
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