Declension of the word "thesaurus"

Singular and plural for Thesaurus, m, weak declension     

Singular
Plural
Singular
Nominativ (Wer? Was?)
der Thesaurus
die Thesauren / Thesauri
Genitiv (Wessen?)
des Thesaurus
der Thesauren / Thesauri
Dativ (Wem?)
dem Thesaurus
den Thesauren / Thesauri
Akkusativ (Wen? Was?)
den Thesaurus
die Thesauren / Thesauri
Plural
die Thesauren / Thesauri
der Thesauren / Thesauri
den Thesauren / Thesauri
die Thesauren / Thesauri
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