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Correct: 10-3=7, 11-2=9, 13-4=9, 15-7=8, 18-9=9, 20-10=10, 12-6=6, 11-5=6, 13-6=7, 16-8=8, Incorrect: 10-3=8, 11-1=9, 13-4=4, 15-2=8, 18-6=9, 15-10=10, 12-6=4, 11-5=9, 13-7=8, 16-3=8,

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