/usr/share/doc/glpk-utils/examples/sample.col is in glpk-utils 4.65-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | 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
|