/etc/brltty/Contraction/nabcc.cti is in brltty 5.4-7+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | ###############################################################################
# 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) 1995-2016 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>.
###############################################################################
# This BRLTTY contraction subtable implements the North American Braille
# Computer Code.
include letters-latin.cti
always \s 0
always a 1
always b 12
always c 14
always d 145
always e 15
always f 124
always g 1245
always h 125
always i 24
always j 245
always k 13
always l 123
always m 134
always n 1345
always o 135
always p 1234
always q 12345
always r 1235
always s 234
always t 2345
always u 136
always v 1236
always w 2456
always x 1346
always y 13456
always z 1356
always A 17
always B 127
always C 147
always D 1457
always E 157
always F 1247
always G 12457
always H 1257
always I 247
always J 2457
always K 137
always L 1237
always M 1347
always N 13457
always O 1357
always P 12347
always Q 123457
always R 12357
always S 2347
always T 23457
always U 1367
always V 12367
always W 24567
always X 13467
always Y 134567
always Z 13567
always 1 2
always 2 23
always 3 25
always 4 256
always 5 26
always 6 235
always 7 2356
always 8 236
always 9 35
always 0 356
always & 12346
always = 123456
always ( 12356
always ! 2346
always ) 23456
always * 16
always < 126
always % 146
always ? 1456
always : 156
always $ 1246
always } 12456
always | 1256
always { 246
always ] 124567
always \\ 12567
always [ 2467
always / 34
always + 346
always \# 3456
always > 345
always ' 3
always - 36
always ` 4
always ~ 45
always _ 456
always " 5
always . 46
always ; 56
always , 6
always @ 47
always ^ 457
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