1 + 0 =, 1, 2, 4, 13, 4 + 6 =, 10, 11, 14, 15, 14 + 2 =, 14, 16, 17, 20, 1 + 2 =, 1, 3, 4, 5, 7 + 4 =, 10, 11, 12, 14

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