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This paper has been withdrawn by the author due to a crucial problem associated with Figs. 2 and 3.

This paper has been withdrawn by the author due to an error in the derivation.

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

This paper has been withdrawn by the author due to a crucial problem in Lemma 3. This equation must be changed.

This paper has been withdrawn by the author, due a critical mistake on page 3.

The paper has been withdrawn

This paper has been withdrawn by the author due to a crucial sign error in equation 1

The paper has been withdrawn due to an error in Lemma 1.

This paper has been withdrawn by the author, due a crucial error in the optimization.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.

This paper has been withdrawn due to fundamental errors.

This paper has been withdrawn.

This paper has been withdrawn.

The paper has been withdrawn by change of content and some errors in the examples.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn by the author due to an error.

This paper was withdrawn by arXiv administrators. It is an erroneous duplicate submission of math.NA/0405095.

This paper has been withdrawn at the author's request.

This paper has been withdrawn by the author due to the presented idea is wrong.

This paper has been withdrawn by the author.

The paper is withdrawn due to mistakes in the proofs for Proposition 1.2 and Theorem 2.2.