examples/sample.col
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     1 c sample.col
       
     2 c
       
     3 c This is an example of the vertex coloring problem data
       
     4 c in DIMACS format.
       
     5 c
       
     6 p edge 10 21
       
     7 c
       
     8 e 1 2
       
     9 e 1 6
       
    10 e 1 7
       
    11 e 1 10
       
    12 e 2 3
       
    13 e 2 7
       
    14 e 2 8
       
    15 e 3 4
       
    16 e 3 8
       
    17 e 4 5
       
    18 e 4 8
       
    19 e 4 9
       
    20 e 5 6
       
    21 e 5 9
       
    22 e 5 10
       
    23 e 6 10
       
    24 e 7 8
       
    25 e 7 10
       
    26 e 8 9
       
    27 e 8 10
       
    28 e 9 10
       
    29 c
       
    30 c eof