This file is indexed.

/usr/lib/blacs/comb.dat is in blacs-test-common 1.1-38.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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3                       Number of OPs
'+' '>' '<'             Combine operations to perform
3                       Number of scopes
'R' 'C' 'A'             values for scopes
2                       Repeatability flag (0=no-rep, 1=rep, 2=both)
2                       Coherence flag (0=no-coh, 1=coh, 2=both)
4                       Number of topologies
' ' 'T' 'H' 'f' 'M'     TOP
6                       Number of matrices
3 1 2  25 13 0          M
5 1 3  19 32 0          N
5 1 4  25 14 1          LDASRC
9 1 5  25 22 1          LDADEST
4 1 -1 25 22 1          LDI
4                       Number of dests
0 -1 0 2                RDEST
0 -1 1 0                CDEST
4                       Number of grids
2 1 4 1 1 8 3           NPROW
2 4 1 3 7 1 2           NPCOL