8 - 9 + ? = 17, 4 - ? + 2 = 6, 0 - 1 + ? = 1, 2 - 13 + ? = 15, 14 - ? + 5 = 19, 1 - 3 + ? = 4, 5 - 2 + ? = 7, 6 - ? + 1 = 7, 12 - ? + 5 = 17, 9 - ? + 1 = 10,

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