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This material is based upon work supported by the National Science Foundation under Grant Nos. NSF-DMR-01-21695, NSF-EAR-0221743, NSF-EF-0526747, NSF-DMR-06-04435 and by the Department of Energy under Grant No. DOE-2005-05818. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation or the Department of Energy.


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