1 2 1 3 1 4 1 5 1 6 1 7 1 8 2 3 2 4 2 5 2 6 2 7 2 8 3 4 3 5 3 6 3 7 3 8 4 5 4 6 4 7 4 8 5 6 5 7 5 8 6 7 6 8 7 8 8-1 8-2 8-3 8-4 8-5 8-6 8-7 8-8 7-1 7-2 7-3 7-4 7-5 7-6 7-7 6-1 6-2 6-3 6-4 6-5 6-6 5-1 5-2 5-3 5-4 5-5 4-1 4-2 4-3 4-4 3-1 3-2 3-3 2-1 2-2 1-1
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