Copyright 2015, 2016, 2017 Kevin Ryde This file is part of Graph-Maker-Other. Graph-Maker-Other is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Graph-Maker-Other 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 General Public License for more details. You should have received a copy of the GNU General Public License along with Graph-Maker-Other. If not, see . Version 9, December 2017 - new QuartetTree Version 8, October 2017 - new RookGrid Version 7, August 2017 - new Petersen Version 6, April 2017 - new BiStar Version 5, February 2017 - new TwinAlternateAreaTree Version 4, February 2017 - new NoughtsAndCrosses Version 3, February 2016 - new Beineke, BinaryBeanstalk Version 2, November 2015 - CPAN indexing Version 1, November 2015 - the first version: BinomialTree, FibonacciTree, Hanoi, Keller, Kneser, KnightGrid, TwindragonAreaTree