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This paper has been withdrawn by the author, due an error in claim 1.

This paper has been withdrawn.

This paper has been withdrawn by the author as a major revision is made and a new version is uploaded at arXiv:0812.3120

This paper has been withdrawn by the author, since one of the key results duplicates existing work, as pointed out by a reader. I am currently revising the manuscript.

This paper has been withdrawn by the author.

This paper has been withdrawn

This paper has been withdrawn by the authors. I will do the major revision.

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

This paper has been withdrawn by the author, due a crucial error in the main idea.

This paper has been withdrawn by the author to comply with the journal policy to which it has been submitted.

This paper has been withdrawn by the authors due to new experimental results.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to an error in the data-analysis.

This paper has been withdrawn by the author.

This paper has been withdrawn due to a crucial theoretical and experimental error.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a some errors in figures 2 and 3.

This paper has been withdrawn by the author due to a crucial sign error.

This paper has been withdrawn by the author due to the paper does not belong to Condensed Matter field.