3 - ? + 9 = 12, 2 - ? + 1 = 3, 8 - ? + 1 = 9, 10 - ? + 2 = 12, 5 - ? + 6 = 11, 9 - ? + 10 = 19, 15 - ? + 5 = 20, 0 - 6 + ? = 6, 16 - ? + 1 = 17, 1 - 1 + ? = 2,

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