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#4
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R1...4-1-3-2-6
R2...5-4-6-7-3 R3...8-3-1-5-9 R4...6-1-2-4-3 R5...6-3-4-5-1 R6...8-3-2-6-4 R7...8-9-5-7-3 R8...4-7-5-7-2 R9...9-5-7-8-3 R10..2-11-6-4-5 R11..8-5-7-9-1 R12..13-2-5-4-7 |