/*
 * Please note that NU-Prolog in all its versions is the property of
 * The University of Melbourne and is Copyright 1985, 1995 by it.
 * 
 * All rights are reserved.
 *
 * NU-Prolog is made available for teaching and academic research.
 * It may not be redistributed or used for any other purpose without
 * written permission.
 */