Correct: 21-9=12, 20-9=11, 19-9=10, 18-9=9, 17-9=8, 16-9=7, 15-9=6, 14-9=5, 13-9=4, 12-9=3, 11-9=2, 10-9=1, 9-9=0, Incorrect: 21-9=112, 20-9=0, 19-9=23, 18-9=8, 17-9=7, 16-9=3, 15-9=2, 14-9=90, 13-9=3, 12-9=21, 11-9=0, 10-9=33, 9-9=9,

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