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

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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) 1995-2008 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 BRLTTY text subtable defines all the space characters to be empty
# braille cells.

# generated by ttbtest
space \s 0		SPACE
space \x00a0 0		NO-BREAK SPACE
space \x2002 0		EN SPACE
space \x2003 0		EM SPACE
space \x2004 0		THREE-PER-EM SPACE
space \x2005 0		FOUR-PER-EM SPACE
space \x2006 0		SIX-PER-EM SPACE
space \x2007 0		FIGURE SPACE
space \x2008 0		PUNCTUATION SPACE
space \x2009 0		THIN SPACE
space \x200a 0		HAIR SPACE
space \x202f 0		NARROW NO-BREAK SPACE
space \x205f 0		MEDIUM MATHEMATICAL SPACE