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

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