4, ? + 9 = 13, 3, ? + 12 = 15, 8, ? + 7 = 15, 7, ? + 10 = 17, 0, 1 + ? = 1, 1, ? + 3 = 4, 2, ? + 1 = 3, 5, ? + 1 = 6, 11, ? + 7 = 18, 6, ? + 8 = 14, 15, 4 + ? = 19, 16, 4 + ? = 20, 13, ? + 1 = 14, 9, ? + 9 = 18, 12, ? + 7 = 19.

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