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#2
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![]() R4
6 8 7 --- 1 2 R5 6 4 7 --- 2 5 R6 1 5 3 --- 6 8 R7 4 5 1 --- 9 10 R8 2 1 4 --- 8 9 R9 2 3 8 --- 4 9 R10 5 9 2 --- 1 6 R11 7 2 5 --- 8 4 R12 3 6 5 --- 7 2 R13 ![]() 6 9 2 --- 3 5 |