C o p y l e f t

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.

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--Harel Barzilai, September, 1996.