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/usr/share/liblouis/tables/en-chess.ctb is in liblouis-data 2.5.3-2ubuntu1.

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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) 1995-2008 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 text subtable defines braille representations for the chess figures in
# terms of the letters that are used for them in the English language.

# See: http://en.wikipedia.org/wiki/Chess_symbols_in_Unicode

# generated by ttbtest
punctuation \x2654 137		WHITE CHESS KING
punctuation \x2655 123457		WHITE CHESS QUEEN
punctuation \x2656 12357		WHITE CHESS ROOK
punctuation \x2657 127		WHITE CHESS BISHOP
punctuation \x2658 13457		WHITE CHESS KNIGHT
punctuation \x2659 12347		WHITE CHESS PAWN
punctuation \x265a 13		BLACK CHESS KING
punctuation \x265b 12345		BLACK CHESS QUEEN
punctuation \x265c 1235		BLACK CHESS ROOK
punctuation \x265d 12		BLACK CHESS BISHOP
punctuation \x265e 1345		BLACK CHESS KNIGHT
punctuation \x265f 1234		BLACK CHESS PAWN