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

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