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

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