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

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