1 

     2 Copyright 1991 by the Massachusetts Institute of Technology

     3 

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

     5 documentation for any purpose is hereby granted without fee, provided that

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

     7 copyright notice and this permission notice appear in supporting

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

     9 publicity pertaining to distribution of the software without specific,

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

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

    12 without express or implied warranty.

    13