This file is indexed.

/etc/brltty/attrib.atb is in brltty 4.3-1ubuntu5.

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

The actual contents of the file can be viewed below.

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###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
#          text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2011 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://mielke.cc/brltty/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

# BRLTTY Attributes Table - 

dot 1 ~fg-blue
dot 2 ~fg-green
dot 3 ~fg-red
dot 7 ~fg-bright
dot 4 =bg-blue
dot 5 =bg-green
dot 6 =bg-red
dot 8 =blink