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This paper has been withdrawn because the models on which it was based have undergone significant changes and improvements. A new paper with the same title, based on the improved models, is accepted for publication in MNRAS and is available…

This paper has been withdrawn.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors due to a major rewriting.

This paper has been withdrawn by the author. The proof of the main result has a gap that the author does not know how to fix it.

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

The paper has been withdrawn due to numerical error.

This paper has been withdrawn by the author due to an error in the last paragraph of step 2 of the main proof, on page 6.

This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.

The paper was retracted.

The authors have withdrawn this paper.

This paper has been withdrawn.

The author has withdrawn this submission.

This paper has been withdrawn by the author, due a crucial error in the optimization. For the last one month I have been trying to remove the error, but it seems to take a lot of time so I decided to withdraw this paper for the moment.

This paper has been withdrawn by the author.

This paper is withdrawn

this paper has been withdrawn by the author due to crucial type errors

This paper has been withdrawn by the authors, because of a crucial gap in the proof of the main theorem.