Larry Pratt provided very useful comments on the manuscript. Dr. Nof’s work is supported by NSF, OCE-0752225, OCE-0928271, and ARC-0902835. Dr. Arruda is supported by Conselho Nacional de Desenvolvemento Cientifico e Tecnologico (CNPq) of the Ministry of Science and Technology of Brazil, under Grant 201627/2010-8.
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