/usr/share/doc/libmeschach-dev/examples/ls.dat is in libmeschach-dev 1.2b-13.
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 | # No. of a problem
2
# A =
Matrix: 5 by 3
row 0: 3 -1 2
row 1: 2 -1 1.2
row 2: 2.5 1 -1.5
row 3: 3 1 1
row 4: -1 1 -2.2
# b =
Vector: dim: 5
5 3 2 4 6
|