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

adding up to 20

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