Correct: 3+4=7, 6+7=13, 7+8=15, 2+3=5, 7+6=13, 4+5=9, 8+9=17, 9+8=17, 8+7=15, Incorrect: 3+4=9, 6+7=15, 7+8=5, 2+3=8, 7+6=12, 4+5=10, 8+9=20, 9+8=16,

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