15 + 3 =, 14, 18, 19, 20, 2 + 1 =, 3, 6, 12, 15, 12 + 8 =, 9, 13, 19, 20, 4 + 6 =, 9, 10, 12, 14, 5 + 8 =, 7, 10, 13, 16, 1 + 0 =, 1, 2, 5, 6, 3 + 4 =, 7, 8, 10, 11, 9 + 9 =, 6, 18, 19, 20, 6 + 11 =, 12, 15, 16, 17, 14 + 3 =, 15, 17, 18, 19

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