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      This material was originally written and compiled by Wietse
         Venema at Eindhoven University of Technology, The Netherlands,
         in 1990, 1991, 1992, 1993, 1994 and 1995.
      Redistribution and use in source and binary forms, with or
         without modification, are permitted provided that this entire
         copyright notice is duplicated in all such copies.
      This software is provided "as is" and without any expressed or
         implied warranties, including, without limitation, the implied
         warranties of merchantibility and fitness for any particular
         purpose.