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c sample.col c c This is an example of the vertex coloring problem data c in DIMACS format. c p edge 10 21 c e 1 2 e 1 6 e 1 7 e 1 10 e 2 3 e 2 7 e 2 8 e 3 4 e 3 8 e 4 5 e 4 8 e 4 9 e 5 6 e 5 9 e 5 10 e 6 10 e 7 8 e 7 10 e 8 9 e 8 10 e 9 10 c c eof