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This paper has been withdrawn by the authors, as it has been rejected in October 2007.
This paper has been withdrawn by the authors; its contents are superseded by that of hep-th/0105305 and hep-th/0212275.
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This paper has been withdrawn by the authors; replaced by arXiv:0705.2531v2 [quant-ph].
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After some communications (EMAIL EXCHANGE) with the co-authors, this article has been withdrawn (for appropriate reason, please refer to the comments section).
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