8, 4 + ? = 12, 2, 14 + ? = 16, 0, 2 + ? = 2, 9, ? + 4 = 13, 4, ? + 3 = 7, 13, ? + 2 = 15, 10, ? + 7 = 17, 5, ? + 11 = 16, 3, ? + 3 = 6, 11, 2 + ? = 13, 1, 11 + ? = 12, 16, 4 + ? = 20, 7, 3 + ? = 10, 6, 5 + ? = 11, 14, 1 + ? = 15.

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