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In the (current) Internet spirit of resistance to the commodification of information, this paper may be freely reproduced for non-profit educational purposes. Any such reproduction must include the paper in its entirety (including this notice). Reproduction for profit and/or non- educational purposes require permission of the author (contact author directly or c/o Howard Besser, howard@sims.berkeley.edu). Permission is also freely granted to reproduce short excerpts within the context of a review or other work as long as proper credit is given.