0 - ? + 2 = 2, 7 - 7 + ? = 14, 5 - 13 + ? = 18, 10 - ? + 10 = 20, 8 - ? + 4 = 12, 1 - ? + 1 = 2, 17 - ? + 2 = 19, 6 - ? + 10 = 16, 3 - 12 + ? = 15, 4 - ? + 4 = 8,

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