As of September 1, 1998, the first two authors can
be reached at Computer Science Division, University of California,
Berkeley, CA 94720. Sponsored by DARPA under grant
F19628-96-C-0061, the U.S. Postal Service, and Toshiba
Corporation. The U.S. Government is authorized to reproduce and
distribute reprints for Government purposes, notwithstanding any
copyright notation thereon. Views and conclusions contained in
this document are those of the authors and should not be
interpreted as representing the official poilicies, either express
or implied, of any of the supporting organizations or the U.S
Government.
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