11, ? + 7 = 18, 7, ? + 6 = 13, 0, ? + 3 = 3, 1, 7 + ? = 8, 12, 2 + ? = 14, 6, 1 + ? = 7, 8, ? + 8 = 16, 3, 17 + ? = 20, 5, 14 + ? = 19, 4, ? + 7 = 11, 9, ? + 5 = 14, 2, ? + 6 = 8, 16, 1 + ? = 17, 13, ? + 7 = 20, 10, ? + 9 = 19.

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