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

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