Corretto: 7+4=11, 7+7=14, 10+15=25, 8+9=17, 8+8=16, 9+3=12, 2+6=8, Errato: 7+4=12, 7+7=18, 10+15=35, 8+9=18, 8+8=18, 9+3=13, 2+6=18,

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