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The work described in this paper was sponsored by NASA under Grant No. NAG 5-2736, by the National Science Foundation under Grant No. ASC-9103853, and by AT& Bell Laboratories.

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Author to whom correspondence should be directed. 107 Ayres Hall, Computer Science Department, University of Tennessee, Knoxville, TN 37996-1301, (615) 974-5886, browne@cs.utk.edu

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