This material was developed by Sun Wu and Udi Manber at the University of Arizona, Department of Computer Science. Permission is granted to copy this software, to redistribute it on a nonprofit basis, and to use it for any purpose, subject to the following restrictions and understandings. 1. Any copy made of this software must include this copyright notice in full. 2. All materials developed as a consequence of the use of this software shall duly acknowledge such use, in accordance with the usual standards of acknowledging credit in academic research. 3. The authors have made no warranty or representation that the operation of this software will be error-free or suitable for any application, and they are under under no obligation to provide any services, by way of maintenance, update, or otherwise. The software is an experimental prototype offered on an as-is basis. 4. Redistribution for profit requires the express, written permission of the authors.