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CASIO fx-991DE X von der Sek I bis zum Abitur mit CD-ROM' - '12. Klasse' Schulbuch - '978-3-86814-370-6'
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Why does the German version of the Casio fx-991EX, the fx-991DE X, have more functions than the US version? : r/calculators
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Amazon.com: Casio FX-991DE X Scientific Calculator with Natural Display (only German Language) : Office Products
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