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Dept.~of Computer and Information Science and Engineering,
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Univ.~of Florida, Gainesville, FL, USA.
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email: davis@cise.ufl.edu.
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http://www.cise.ufl.edu/$\sim$davis.
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Science Foundation, under grants ASC-9111263, DMS-9223088, and CCR-0203270.
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Portions of the work were done while on sabbatical at Stanford University
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and Lawrence Berkeley National Laboratory (with funding from Stanford
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University and the SciDAC program).
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