Related papers: Regev's theorem via rectangles

This paper has been withdrawn by the authors due to a crucial error.

This paper has been withdrawn by the author due to a crucial errors.

This paper has been withdrawn by the authors due to numerical problems to get viable results.

This paper has been withdrawn by the author due to a serious mistake on Lemma 2.4.

This paper has been withdrawn due to crucial errors.

This paper has been withdrawn by the author, due a crucial error in Eq. 6.

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

This paper has been withdrawn

This paper has been withdrawn by the author due to the gaps in the proofs of Proposition 2.2 and Proposition 3.2

This paper has been withdrawn by the author due to a error in attachment of source file.

This paper has been withdrawn

This paper has been withdrawn by the author(s)

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author due to extremely unscientific errors.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

This paper has been withdrawn by the author, due to errors in Groebner basis calculations in the cases of five and six dimensional groups.

This paper has been withdrawn by the author. The paper has been accepted for publication in Communications on Pure and Applied Mathematics.

This paper has been withdrawn by the authors, due to the requirement of the Journal where a modified version will be published.

The paper has been withdrawn due to an error in the main theorem.

This paper was withdrawn by the authors. Lemma 5.1 is wrong.