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This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2073.

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The article is withdrawn. Its content is contained in the final version of arXiv:0805.1634.

This paper has been removed by arXiv administrators because it plagiarizes gr-qc/0203084, gr-qc/0607138, gr-qc/0011087, gr-qc/0102070, gr-qc/0607138, gr-qc/0109017, gr-qc/0212018, and gr-qc/9409039.

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Withdrawn by arXiv administration. This article was plagiarised directly from http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5061961 , which appeared in the conference INFOCOM 2009.

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This paper has been withdrawn by the authors, since it has been merged with Part I (ID 0802.3570)

This paper has been withdrawn by the author. The conjecture follows from the finiteness of group von Neumann algebras.

This paper has been withdrawn by the authors.