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Correct: 2+2=4, 20-5=15, 13-4=9, 7+8=15, 6+8=14, 18-9=9, 5+6=11, 7-5=2, 6+4=10, 14-9=5, Incorrect: 2+2=2, 20-5=5, 13-4=8, 7+8=14, 6+8=13, 18-9=7, 5+6=12, 7-5=3, 6+4=11, 14-9=7,

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