Declension of the word "Heizungskeller"

Singular and plural for Heizungskeller, m, strong declension     

Singular
Plural
Singular
Nominativ (Wer? Was?)
der Heizungskeller
die Heizungskeller
Genitiv (Wessen?)
des Heizungskellers
der Heizungskeller
Dativ (Wem?)
dem Heizungskeller
den Heizungskellern
Akkusativ (Wen? Was?)
den Heizungskeller
die Heizungskeller
Plural
die Heizungskeller
der Heizungskeller
den Heizungskellern
die Heizungskeller
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