The first draft of this paper was published in February 1997, simultaneously as Working Paper No. 97-02-012 of the Santa Fe Institute and as Technical Report No. bmcm9703 of the Dublin City University ALife Laboratory. This is a revised version, presented at ECAL-97, Brighton, UK July 1997, proceedings published by The MIT Press, edited by Phil Husbands and Inman Harvey.
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Timestamp: Tue Apr 22 22:10:03 GMT 1997