This file is indexed.

/etc/boxshade/clust160.grp is in boxshade 3.3.1-10.

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

The actual contents of the file can be viewed below.

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This file is a Amino-acid grouping file for use with NEWBOX.
Each line contains a set of amino acids which are considered
'similar' when calculating the consensus. The .SIM file is different
and is used in colouring residues that are "similar" to a single
consensus residue.
This table was taken from ClustalW v1.60
Other format requirements are the same as for SIMPLIFY.TXT in the
GCG-package.
..
ACST
NT
EQ
NQ
ED
KRQH
GN
NH
FY
IVLM