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Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès

Copyright © 2013, 2014 Andreas Enge

Copyright © 2013 Nikita Karetnikov

Copyright © 2015 Mathieu Lirzin

Copyright © 2014 Pierre-Antoine Rault

Copyright © 2015 Taylan Ulrich Bayırlı/Kammer

Copyright © 2015, 2016 Leo Famulari

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''.