code: ///////////////////////////////////////////////////////////////////////////////
  // For information as to what this class does, see the Javadoc, below.       //
  // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
  // 2007, 2008, 2009, 2010, 2014, 2015 by Peter Spirtes, Richard Scheines, Joseph   //
  // Ramsey, and Clark Glymour.                                                //
  //                                                                           //
  // This program 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 2 of the License, or         //
  // (at your option) any later version.                                       //
  //                                                                           //
  // This program 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 this program; if not, write to the Free Software               //
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA //
  ///////////////////////////////////////////////////////////////////////////////
  
  package edu.cmu.tetrad.graph;
  
  /**
   * I couldn't find a mechanism in place to manage algorithm that return
   * potentially more than 1 graph. As such, this interface helps with that.
   * <p>
   * Created by IntelliJ IDEA.
   * User: Mark Whitehouse
   * Date: Nov 28, 2008
   * Time: 7:55:55 PM
   * To change this template use File | Settings | File Templates.
   */
  
  public interface GraphGroup {
  
      /**
       * @return int
       */
      int getNumGraphs();
  
      /**
       * Gets a graph at a specific index
       *
       * @param g The index of the graph to return
       * @return Graph
       */
      Graph getGraph(int g);
  
      /**
       * Adds a graph to the class.
       *
       * @param g The graph to add to the class.
       */
      void addGraph(Graph g);
  
  }
  
  
  