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I thank Marc Cygnus, Robert Eisenberg, Doyne Farmer, Walter Fontana, Stephanie Forrest, Chris Langton, Dan Pirone, Stephen Pope, and Steen Rasmussen, for their discussions or readings of the manuscripts. I thank the Santa Fe Institute for their support. Contribution No. 180 from the Ecology Program, School of Life and Health Sciences, University of Delaware.

Thomas S.Ray
Thu Aug 3 15:47:29 JST 1995