First published in August 2000 as Technical Report No. bmcm-2000-01 of the Artificial Life Laboratory of Dublin City University. First presented at the conference Artificial Life VII August 1-6, 2000, Reed College, Portland, Oregon. Essentially the same text appears in Artificial Life VII: Proceedings of the Seventh International Conference, edited by Mark A. Bedau, John S. McCaskill, Norman H. Packard, and Steen Rasmussen (MIT Press, 2000), pp. 467-476.
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