Correct: 8+7=15, 7+6=13, 5+6=11, 15-8=7, 13-7=6, 11-5=6, 11-6=5, 13-6=7, 15-7=5, Incorrect: 8+7=13, 7+6=15, 5+6=13, 15-8=5, 13-7=11, 11-5=7, 11-6=3, 13-6=5, 15-7=7,

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