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

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