 Copyright (C) 1989, 1990, 1991 Massachusetts Institute of Technology

			   COPYING POLICIES

  1. You may copy and distribute verbatim copies of this source code
as you receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy a valid copyright notice "Copyright
(C) 1989 Massachusetts Institute of Technology" (or with whatever year
is appropriate); keep intact the notices on all files that refer to
this License Agreement and to the absence of any warranty; and give
any other recipients of the program a copy of this License Agreement
along with the program.  You may charge a distribution fee for the
physical act of transferring a copy.

  2. You may modify your copy or copies of the source code or any
portion of it, and copy and distribute such modifications under the
terms of Paragraph 1 above, provided that you also do the following:

    a) cause the modified files to carry prominent notices stating
    that you changed the files and the date of any change; and

    b) cause the whole of any work that you distribute or publish,
    that in whole or in part contains or is a derivative of this
    soource code or any part thereof, to be licensed at no charge to
    all third parties on terms identical to those contained in this
    License Agreement (except that you may choose to grant more
    extensive warranty protection to some or all third parties, at
    your option).

    c) if the modified program runs interactively, cause it when
    started running in the simplest and usual way, to print an
    announcement including a valid copyright notice "Copyright (C)
    1989 Massachusetts Institute of Technology" (or with the year that
    is appropriate), saying that there is no warranty (or else, saying
    that you provide a warranty) and that users may redistribute the
    program under these conditions, and telling the user how to view a
    copy of this License Agreement.

    d) You may charge a distribution fee for the physical act of
    transferring a copy, and you may at your option offer warranty
    protection in exchange for a fee.

Mere aggregation of another unrelated program with this program (or
its derivative) on a volume of a storage or distribution medium does
not bring the other program under the scope of these terms.

  3. You may copy and distribute this soource code (or a portion or
derivative of it, under Paragraph 2) in object code or executable form
under the terms of Paragraphs 1 and 2 above provided that you also do
one of the following:

    a) accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of
    Paragraphs 1 and 2 above; or,

    b) accompany it with a written offer, valid for at least three
    years, to give any third party free (except for a nominal shipping
    charge) a complete machine-readable copy of the corresponding
    source code, to be distributed under the terms of Paragraphs 1 and
    2 above; or,

    c) accompany it with the information you received as to where the
    corresponding source code may be obtained.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form alone.)

For an executable file, complete source code means all the source code
for all modules it contains; but, as a special exception, it need not
include source code for modules which are standard libraries that
accompany the operating system on which the executable file runs.

  4. You may not copy, sublicense, distribute or transfer this
software except as expressly provided under this License Agreement.
Any attempt otherwise to copy, sublicense, distribute or transfer this
software is void and your rights to use this software under this
License agreement shall be automatically terminated.  However, parties
who have received computer software programs from you with this
License Agreement will not have their licenses terminated so long as
such parties remain in full compliance.


			   NO WARRANTY

  BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, WE PROVIDE
ABSOLUTELY NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE
LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING, MASSACHUSETTS INSTITUTE
OF TECHNOLOGY AND/OR OTHER PARTIES PROVIDE THIS SOFTWARE "AS IS"
WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY
AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.

 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL MASSACHUSETTS
INSTITUTE OF TECHNOLOGY AND/OR ANY OTHER PARTY WHO MAY MODIFY AND
REDISTRIBUTE THIS SOFTWARE AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES, OR OTHER SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR A
FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAM) THE PROGRAM,
EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR
FOR ANY CLAIM BY ANY OTHER PARTY.
