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This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the corresponding author because the newest version is now published in Discrete Applied Mathematics.

This paper has been withdrawn by the author because in the main text some discussion parts were inadvertently added by mistake.

We would like to withdraw this article for the following reasons: 1 this article is not satisfactory for limited language and theoretical description; 2 we have enriched and revised this article with the help of other authors; 3 we must…

This paper has been withdrawn

This paper has been withdrawn by the author due to similarity to Author's other paper

This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper has been withdrawn by the author

This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.

This paper is withdrawn by the author. See math.GT/9811093 for replacement.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors due to a fatal flaw in the central proof.

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn by the author, due to a crucial error in the proof of Thm.1

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author.