Corretto: 9 - 3 = 6, 5 - 3 = 2, 7 - 3 = 4, 8 - 7 = 1, 3 - 2 = 1, 7 - 5 = 2, 6 - 3 = 3, 2 - 2 = 0, Errato: 7 - 4 = 5, 8 - 3 = 1, 5 - 5 = 1, 4 - 3 = 6, 6 - 4 = 1, 7 - 6 = 5, 4 - 3 = 2, 10 - 3 = 5,

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