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This document includes text contributed by
Nikos Mavrogiannopoulos, Simon Josefsson, Daiki Ueno, 
Carolin Latze, Alfredo Pironti, Ted Zlatanov and Andrew McDonald. Several corrections are due
to Patrick Pelletier and Andreas Metzler.
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ISBN 978-1-326-00266-4\\
Copyright \copyright{} 2001-2015 Free Software Foundation, Inc.\\
Copyright \copyright{} 2001-2019 Nikos Mavrogiannopoulos
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Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
copy of the license is included in the section entitled ``GNU Free
Documentation License''.
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