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This paper has been temporarily withdrawn by the author(s),

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors

This paper has been withdrawn by the author(s),

This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the publication.

This paper has been withdrawn by the author, due to the fact that a similar paper (quant-ph/9904075) has been published.

The paper has bene withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the authors because the paper is largely revised and improved.

This paper has been withdrawn by the author.

This paper has been withdrawn since it was an inadvertant double submission. An updated version of the original submission can be found at quant-ph/0505131

This paper has been withdrawn by the author, due a crucial error in the optimization. For the last one month I have been trying to remove the error, but it seems to take a lot of time so I decided to withdraw this paper for the moment.