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