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/usr/share/liblouis/tables/controlchars.cti is in liblouis-data 3.0.0-3+deb9u4.

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# liblouis: some control characters

#  Based on the Linux screenreader BRLTTY, copyright (C) 1999-2006 by
#  The BRLTTY Team
#
#  Copyright (C) 2004-2006 ViewPlus Technologies, Inc. www.viewplus.com
#  Copyright (C) 2004-2006 JJB Software, Inc. www.jjb-software.com
#
#  This file is part of liblouis.
#
#  liblouis is free software: you can redistribute it and/or modify it
#  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.
#
#  liblouis is distributed in the hope that it will be useful, but
#  WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with liblouis. If not, see
#  <http://www.gnu.org/licenses/>.

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