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

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