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This paper has been withdrawn by the authors. Because of a misunderstanding, the paper was submitted prematurely to the arXiv. A replacement will follow.

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This paper has been withdrawn by the author because there are some typos in proofs.

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This paper has been withdrawn by the author, since most of the results have been published before.

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This paper has been withdrawn by the author, because it was merged into cs.HC/0508041

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This paper has been withdrawn by the authors. Our basic argument on the gauge invariance presented in this paper cannot withstand the criticism which has been drawn to our attention by several colleagues.