11 Verdoppeln doppelt 3 1 + 1 = 3 + 3 = 4 + 4 = 9 + 9 = 6 + 6 = 8 + 8 = 2 + 2 = 7 + 7 = Nur zu Prüfzwecken – Eigentum des Verlags öbv
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