Declension of the word "Heizsystem"

Singular and plural for Heizsystem, n, strong declension     

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Heizsystem
die Heizsysteme
Genitiv (Wessen?)
des Heizsystemes / Heizsystems
der Heizsysteme
Dativ (Wem?)
dem Heizsystem / Heizsysteme
den Heizsystemen
Akkusativ (Wen? Was?)
das Heizsystem
die Heizsysteme
Plural
die Heizsysteme
der Heizsysteme
den Heizsystemen
die Heizsysteme
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