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This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors; replaced by arXiv:0705.2531v2 [quant-ph].

This paper has been withdrawn by the author, since most of the results have been published before.

This paper has been withdrawn.

This paper has been withdrawn by the author because there are some typos in proofs.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This paper has been withdrawn by the author due to the fact that the results were found to be done previously.

This paper has been withdrawn at the author's request.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn by the author.

The paper was withdrawn by the author. Further research is needed.

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This paper has been withdrawn by the author due to a gap in the proof of the main result.

This paper has been withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a mistake in one of the main lemmas.

This paper has been temprally withdrawn by the author