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

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