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This paper has been withdrawn by the author due to errors.

This version of the paper has been withdrawn due to an error. Please contact one of the authors for an updated copy.

This paper is withdrawn. We found a mistake in Lemma 4.1

This paper has been withdrawn: it has been merged with the preprint to which it refers.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn due to its publication

This paper has been withdrawn by the authors pending corrections.

This paper has been withdrawn by the author

This paper has been withdrawn because of serious errors.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.

This paper has been withdrawn by the author due to an error estimate in Lemma 3.1.

The paper has been withdrawn due to numerical error.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn by the author due to an error.

The paper was withdrawn because of its significant overlap with a paper appeared recently.

This results in this paper have been merged with the result in arXiv:1003.0167. The authors would like to withdraw this version. Please see arXiv:1008.5356 for the merged version.

This paper has been withdrawn by the author due a few mistakes in the paper.

The paper is being withdrawn since the results are incorporated in paper arxiv.org/abs/math.AG/0306195.