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Begonnen, den $-Operator gemeinsam mit Listen einzuführen, um zu erklären, dass Data Frames Listen sind und deswegen den $-Operator verwenden. Was noch zu tun ist: Eventuell auf die Begriffe "Klasse" und "Datentyp" eingehen; "Datentyp" und "Datenstruktur" unterscheiden? Was auch noch zu tun ist: Übungen ausdenken um $ an Data Frames anzuwenden. eventuell statt immer Beispiele zu konstruieren im folgenden Kapitel dann mal mit einem richtigen Datensatz arbeiten.
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