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

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