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This paper has been withdrawn. A significantly revised version will be posted in the near future.

This paper has been withdrawn by the author, since most of the results have been published before.

This paper has been withdrawn because of serious errors.

The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .

This paper is withdrawn.

This paper has been withdrawn due to disagreement of suggested results and methods between authors.

This paper has been withdrawn by the authors.

This paper has been withdrawn.

This paper was withdrawn by the author.

This paper was withdrawn by the authors.

The paper has been withdrawn by the author.

This paper has been withdrawn

This paper has been withdrawn by the authors because the results obtained have been reported earlier by other authors.

This paper has been withdrawn by the author(s)

This paper has been withdrawn by the author due to a misunderstanding about 3QBF.

This paper has been withdrawn by the author, due to an error in Proposition 2.2.

This paper has been withdrawn by the author

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.