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

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