Correct: 4-1=3, 3-1=2, 12-1=11, 10-1=9, 6-1=5, 1-0=1, 8-1=7, 9-1=8, Incorrect: 4-1=2, 3-1=4, 12-1=9, 10-1=11, 6-1=4, 1-0=2, 8-1=4, 9-1=10,

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