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

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