/etc/brltty/letters-latin-dot8.tti 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>.
###############################################################################
# This BRLTTY text subtable defines the braille representations for the letters
# of the Latin alphabet by adding dot 8 to their standard representations.
# lowercase letters
char \x61 (1 8) # ⢁ a [LATIN SMALL LETTER A]
char \x62 (12 8) # ⢃ b [LATIN SMALL LETTER B]
char \x63 (1 4 8) # ⢉ c [LATIN SMALL LETTER C]
char \x64 (1 45 8) # ⢙ d [LATIN SMALL LETTER D]
char \x65 (1 5 8) # ⢑ e [LATIN SMALL LETTER E]
char \x66 (12 4 8) # ⢋ f [LATIN SMALL LETTER F]
char \x67 (12 45 8) # ⢛ g [LATIN SMALL LETTER G]
char \x68 (12 5 8) # ⢓ h [LATIN SMALL LETTER H]
char \x69 ( 2 4 8) # ⢊ i [LATIN SMALL LETTER I]
char \x6A ( 2 45 8) # ⢚ j [LATIN SMALL LETTER J]
char \x6B (1 3 8) # ⢅ k [LATIN SMALL LETTER K]
char \x6C (123 8) # ⢇ l [LATIN SMALL LETTER L]
char \x6D (1 34 8) # ⢍ m [LATIN SMALL LETTER M]
char \x6E (1 345 8) # ⢝ n [LATIN SMALL LETTER N]
char \x6F (1 3 5 8) # ⢕ o [LATIN SMALL LETTER O]
char \x70 (1234 8) # ⢏ p [LATIN SMALL LETTER P]
char \x71 (12345 8) # ⢟ q [LATIN SMALL LETTER Q]
char \x72 (123 5 8) # ⢗ r [LATIN SMALL LETTER R]
char \x73 ( 234 8) # ⢎ s [LATIN SMALL LETTER S]
char \x74 ( 2345 8) # ⢞ t [LATIN SMALL LETTER T]
char \x75 (1 3 6 8) # ⢥ u [LATIN SMALL LETTER U]
char \x76 (123 6 8) # ⢧ v [LATIN SMALL LETTER V]
char \x77 ( 2 456 8) # ⢺ w [LATIN SMALL LETTER W]
char \x78 (1 34 6 8) # ⢭ x [LATIN SMALL LETTER X]
char \x79 (1 3456 8) # ⢽ y [LATIN SMALL LETTER Y]
char \x7A (1 3 56 8) # ⢵ z [LATIN SMALL LETTER Z]
# uppercase letters
char \x41 (1 78) # ⣁ A [LATIN CAPITAL LETTER A]
char \x42 (12 78) # ⣃ B [LATIN CAPITAL LETTER B]
char \x43 (1 4 78) # ⣉ C [LATIN CAPITAL LETTER C]
char \x44 (1 45 78) # ⣙ D [LATIN CAPITAL LETTER D]
char \x45 (1 5 78) # ⣑ E [LATIN CAPITAL LETTER E]
char \x46 (12 4 78) # ⣋ F [LATIN CAPITAL LETTER F]
char \x47 (12 45 78) # ⣛ G [LATIN CAPITAL LETTER G]
char \x48 (12 5 78) # ⣓ H [LATIN CAPITAL LETTER H]
char \x49 ( 2 4 78) # ⣊ I [LATIN CAPITAL LETTER I]
char \x4A ( 2 45 78) # ⣚ J [LATIN CAPITAL LETTER J]
char \x4B (1 3 78) # ⣅ K [LATIN CAPITAL LETTER K]
char \x4C (123 78) # ⣇ L [LATIN CAPITAL LETTER L]
char \x4D (1 34 78) # ⣍ M [LATIN CAPITAL LETTER M]
char \x4E (1 345 78) # ⣝ N [LATIN CAPITAL LETTER N]
char \x4F (1 3 5 78) # ⣕ O [LATIN CAPITAL LETTER O]
char \x50 (1234 78) # ⣏ P [LATIN CAPITAL LETTER P]
char \x51 (12345 78) # ⣟ Q [LATIN CAPITAL LETTER Q]
char \x52 (123 5 78) # ⣗ R [LATIN CAPITAL LETTER R]
char \x53 ( 234 78) # ⣎ S [LATIN CAPITAL LETTER S]
char \x54 ( 2345 78) # ⣞ T [LATIN CAPITAL LETTER T]
char \x55 (1 3 678) # ⣥ U [LATIN CAPITAL LETTER U]
char \x56 (123 678) # ⣧ V [LATIN CAPITAL LETTER V]
char \x57 ( 2 45678) # ⣺ W [LATIN CAPITAL LETTER W]
char \x58 (1 34 678) # ⣭ X [LATIN CAPITAL LETTER X]
char \x59 (1 345678) # ⣽ Y [LATIN CAPITAL LETTER Y]
char \x5A (1 3 5678) # ⣵ Z [LATIN CAPITAL LETTER Z]
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