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