SAT4J: a SATisfiability library for Java.

    /*
     * SAT4J: a SATisfiability library for Java
     * Copyright (C) 2004-2006 Daniel Le Berre
     *
     * Based on the original minisat specification from:
     *
     * An extensible SAT solver. Niklas Eén and Niklas Sörensson.
     * Proceedings of the Sixth International Conference on Theory
     * and Applications of Satisfiability Testing, LNCS 2919,
     * pp 502-518, 2003.
     *
     * This library 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.
     *
     * This library 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 this library; if not, write to the Free Software
     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     *
     */