This research is supported in part by NSF grants CCR-912008
and CCR-9527130. This work constitutes part of the Caltech
Infospheres Project; more information is available on the Web at
http://www.infospheres.caltech.edu/. Note that this paper
is Copyright 1996 IEEE, Published in the Proceedings of the 30th
Hawaii International Conference on System Sciences, January 7-10, 1997,
Maui, Hawaii.
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