8 + ? = 10, 10, 6, 20, ? + 7 = 9, 5, 21, 2, 5 + ? = 9, 7, 8, 4, 9 + ? = 10, 5, 6, 1, 3 + ? = 8, 2, 5, 4, ? + 2 = 9, 5, 7, 8, ? + 5 = 7, 10, 11, 2, 5 + ? = 10, 4, 5, 6, 5 + ? = 10, 4, 5, 7, 1+ ? = 8, 8, 6, 7, 3 + ? = 5, 5, 2, 7, 7 + ? = 9, 5, 2, 3, ? + 5 = 7, 2, 11, 6, ? + 3 = 10, 5, 8, 7, 8 + ? = 10, 7, 2, 9

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