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(6 (6, 4, 2, 8), 8 (4, 6, 2, 8), 4 (8, 6, 2, 4), 2 (8, 6, 4, 2))
6
6
4
2
8
8
4
6
2
8
4
8
6
2
4
2
8
6
4
2