Copyleft: © Copyright by Harel
Barzilai; any downloading, display, reproduction either analog or
digital, or redistribution of this work for non-profit
educational purposes is permitted, and heartily encouraged, provided
the work is unaltered and credit is given to the author
(pedagogical modifications for
non-profit educational use are fine; email me
if you are unsure).
May not use for any other purpose without written permission.
Support the Free Software Foundation, League For Programming Freedom and related projects.
This is modified from the Free Software Foundation's CopyLeft
--Harel Barzilai, September, 1996.