Correct: 16-9=7, 16-7=9, 15-8=7, 15-7=8, 11-4=7, 11-7=4, 13-8=5, 13-5=8, 11-6=5, 11-5=6, Incorrect: 16-9=17, 16-9=0, 11-7=2, 13-5=5, 11-4=5, 11-6=4, 11-5=9, 13-8=1, 15-7=0, 15-8=3,

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