_______________________________________________________________________________

  Copyright (c) 1993, 1994, 1995 Giuseppe Attardi and Tito Flagella
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Summary:

  Permission is granted to use, copy, modify this program,
  EXCEPT that the copyright notice must be reproduced on copies, and
  credit should be given to the authors where it is due.
  WE MAKE NO WARRANTY AND ACCEPT NO LIABILITY FOR THIS PROGRAM.


In detail:

  Permission to use, copy, and modify this software and its documentation is
  hereby granted only under the following terms and conditions.  Both the
  above copyright notice and this permission notice must appear in all copies
  of the software, derivative works or modified versions, and any portions
  thereof, and both notices must appear in supporting documentation.

  Users of this software agree to the terms and conditions set forth herein,
  and agree to license at no charge to all parties under these terms and
  conditions any derivative works or modified versions of this software.
  
  This software may be distributed (but not offered for sale or transferred
  for compensation) to third parties, provided such third parties agree to
  abide by the terms and conditions of this notice.  
  
  THE SOFTWARE IS PROVIDED "AS IS" AND THE COPYRIGHT HOLDERS DISCLAIM ALL
  WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL THE COPYRIGHT HOLDERS
  BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR
  ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.


Address:

  Giuseppe Attardi		  Tito Flagella
  Dipartimento di Informatica	  Dipartimento di Informatica 
  Corso Italia 40		  Corso Italia 40             
  I-56125 Pisa, Italy		  I-56125 Pisa, Italy         
  attardi@di.unipi.it         	  tito@di.unipi.it         

Address for reporting bugs, comments, suggestions:

  cmm@di.unipi.it

Contributors:

	Uttam M. Narsu	<narsu@styx.hks.com>
	Pietro Iglio	<iglio@di.unipi.it>
	Hans J. Boehm	<boehm@mti.sgi.com>