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This material is based upon work sponsored by a variety of agencies and sources, including the National Science Foundation under Grant No.s 0205724, 0430066, 0438996, and 0524033, the Boeing Company, and, previously, the Air Force Materiel Command, Rome Laboratory, and the Defense Advanced Research Projects Agency under Contract Number F30602-94-C-0218. The content of the information does not necessarily reflect the position or the policy of the Government or any sponsor and no official endorsement should be inferred. 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.