Copyright (c)2000-2001 Baldoni Matteo
All rights reserved EXCEPT as allowed by the following statements: 
You can freely use this file for your own work (personal or commercial),
including modifications and distribution in executable form only. 
Permission is granted to use this file in classroom situations. 
Except in classroom situations, you cannot copy and distribute 
this code; instead, the sole distribution point is 
http://www.di.unito.it/~baldoni where it is freely available. 
You cannot remove this copyright and notice. You cannot distribute
modified versions of the source code in this package. You cannot 
use this file in printed media without the express permission of the
author. Baldoni Matteo makes no representation about the suitability 
of this software for any purpose. It is provided "as is" without 
express or implied warranty of any kind, including any implied
warranty of merchantability, fitness for a particular purpose or 
non-infringement. The entire risk as to the quality and performance 
of the software is with you. Baldoni Matteo  shall not be liable 
for any damages suffered by you or any third party as a result of
using or distributing software. In no event will
Baldoni Matteo be liable for any lost revenue, profit, or data, 
or for direct, indirect, special, consequential, incidental, or
punitive damages, however caused and regardless of the theory of 
liability, arising out of the use of or inability to use software, 
even if Baldoni Matteo have been advised of the possibility of 
such damages. Should the software prove defective, you assume the 
cost of all necessary servicing, repair, or correction. If you
think you've found an error, please submit the correction sending 
an email to baldoni@di.unito.it