4, ? + 3 = 7, 0, ? + 6 = 6, 9, ? + 1 = 10, 1, ? + 2 = 3, 8, ? + 1 = 9, 7, 6 + ? = 13, 2, 13 + ? = 15, 3, ? + 12 = 15, 5, ? + 9 = 14, 6, 12 + ? = 18.

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