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5 - 1 + ? = 6, 10 - ? + 3 = 13, 7 - 9 + ? = 16, 13 - ? + 7 = 20, 0 - 13 + ? = 13, 4 - 10 + ? = 14, 12 - ? + 8 = 20, 2 - ? + 3 = 5, 6 - 4 + ? = 10, 1 - ? + 18 = 19, 15 - 2 + ? = 17, 11 - ? + 5 = 16, 9 - 3 + ? = 12, 8 - 11 + ? = 19, 16 - 1 + ? = 17,

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