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This paper has been withdrawn. (Reason) Its contents have been entirely superseded by the contents of the articles arXiv:0809.3444 and arXiv:0705.3070. There is no profitable reason to keep it alive. No material on it is however wrong.
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This paper was withdrawn by arXiv admins because of inappropriate and unverifiable claims of appropriation.
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This submission has been withdrawn by arXiv admins due to fraudulent affiliation claims by the original submitter.
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This preprint has been withdrawn. It is because I will never publish this preprint since everything has been contained in my new preprint: arXiv:0907.1506. Please refer to arXiv:0907.1506. Please do not cite this preprint any more.
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This paper has been withdrawn since its content is included in the more general version arXiv:0804.1882
This paper has been withdrawn.
The authors have withdrawn this article [arXiv admin].
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This preprint has been withdrawn. It is because I will never publish this preprint since everything has been contained in my new preprint: arXiv:0907.1506. Please refer to arXiv:0907.1506. Please do not cite this preprint any more.
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