This file is indexed.

/etc/brltty/Input/hm/f18.kti is in brltty 5.5-4ubuntu2.

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) 1995-2017 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://brltty.com/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

bind F1 PRPROMPT
bind F2 NXPROMPT
bind F3 PRPGRPH
bind F4 NXPGRPH

bind F5 LEARN
bind F6 TIME
bind F7 CHRLT
bind F8 CHRRT

bind Space+F1 BRLKBD
bind Space+F2 BRLUCDOTS
bind Space+F3 SKPIDLNS
bind Space+F4 CONTEXT+KEY_FUNCTION

bind Space+F5 CONTEXT+SWITCHVT
bind Space+F6 SKPBLNKWINS
bind Space+F7 ATTRVIS
bind Space+F8 CSRVIS

context SWITCHVT
bind RoutingKey SWITCHVT