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