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The paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the author due to an error in the proof of Theorem 1.

This paper has been withdrawn, not because of any errors (that we know of), but because rather than presenting our material as a series of 3 papers, as we originally intended, we have now combined them into one long paper, which is "A…

This paper has been withdrawn by the author due to the paper does not belong to Condensed Matter field.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn by the author because in the main text some discussion parts were inadvertently added by mistake.

This paper has been withdrawn.

This paper has been withdrawn by the author. It will be replaced, substantially modified, by sections of the author's completed PhD thesis.

This paper has been withdrawn by the author due to some mistakes

This paper has been withdrawn

This paper has been withdrawn by the author due to a crucial error in the submission action.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been withdrawn by the author due to similarity to the author's other paper

This paper has been withdrawn by the authors

This paper has been withdrawn since we combine this paper with math.AC/0503685. All contents of the paper have been moved to math.AC/0503685.

This paper has been withdrawn.

This paper has been withdrawn, because it is subsumed by the new preprint arXiv:0806.4540 .