Copyright 2013, Michael H. Goldwasser

Developed for use with the book:

   Data Structures and Algorithms in Python
   Michael T. Goodrich, Roberto Tamassia, and Michael H. Goldwasser
   John Wiley & Sons, 2013

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 3 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, see <http://www.gnu.org/licenses/>.