This is a simple text-mode sudoku puzzle solver.  Sudoku is a
    number game that has been published in the Sunday newspapers in
    some cities.  For more information see http://www.sudoku.com or
    http://en.wikipedia.org/wiki/Sudoku.  You can use this program to
    enter a puzzle and have it search for the solution.

/* Copyright (c) 2006 Scott Gasch
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */