Corretto: 5+5, 6+4, 4+6, 7+3, 3+7, 8+2, 2+8, 9+1, 1+9, Errato: 6+5, 4+7, 8+4, 5+6, 7+4, 3+8, 6+6, 9+2, 8+3,

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