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Close-up of a dusty blackboard with "8x8=91" written in chalk, with sunlight streaming from a window.

Close-up of a dusty blackboard with "8x8=91" written in chalk, with sunlight streaming from a window.

Eine Schiefertafel mit Kreide. Auf der Tafel steht 8x8=91 wobei die 1 nur ein senkrechter Strich ist. Mehr sehen

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