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

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