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Σωστό: 12 + 6 = 18, 11 + 7 = 18, 17 - 1 = 16, 15 - 4 = 11, 12 + 5 = 17, 18 - 5 =13, Λάθος: 16 + 3 = 18, 11 + 7 = 19, 19 - 4 = 5, 14 + 4 = 8, 18 - 4 = 13, 16 - 5 = 12,

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