Copyright 1988 Massachusetts Institute of Technology

Permission to use, copy, modify, and distribute this software and its

documentation for any purpose and without fee is hereby granted, provided

that the above copyright notice appear in all copies and that both that

copyright notice and this permission notice appear in supporting

documentation, and that the name of M.I.T. not be used in advertising or

publicity pertaining to distribution of the software without specific,

written prior permission.  M.I.T. makes no representations about the

suitability of this software for any purpose.  It is provided "as is"

without express or implied warranty.