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This paper is withdrawn by the authors.

This article has been withdrawn due to an error in a proof of the main result.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author since the comments have been withdrawn.

This paper has been withdrawn by the author, due to necessity of revision.

This paper has been withdrawn by the author because has been send to other journal.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author due to the paper does not belong to Condensed Matter field.

This paper has been withdrawn by the author due to a crucial error in equation (51).

This paper is withdrawn by the author. See math.GT/9811093 for replacement.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

The paper has been withdrawn by the author.

Although the results are correct, it was pointed out that the results follow from some previously known results. Accordingly, this version of the paper is withdrawn by the authors.

This paper has been withdrawn by the author.The formula which was proposed gives only a second order deformation.

The paper has been withdrawn by the authors for modification.

This paper has been withdrawn. It will be split into two separate papers. New results will be added in both papers.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author due to the gaps in the proofs of Proposition 2.2 and Proposition 3.2

This paper has been withdrawn, because the result turned out to be well known.