13 - 4 + ? = 17, 12 - ? + 8 = 20, 4 - ? + 6 = 10, 7 - ? + 9 = 16, 9 - ? + 5 = 14, 1 - ? + 12 = 13, 10 - ? + 6 = 16, 0 - ? + 1 = 1, 2 - ? + 6 = 8, 11 - ? + 6 = 17,

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