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This paper has been withdrawn.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This paper has been withdrawn by the corresponding author because the newest version is now published in Discrete Applied Mathematics.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been withdrawn by the author

This paper has been withdrawn by the author due to a new work in [arXiv:0901.0456v4] which can contain the results in this paper.

This paper is withdrawn.

The paper was done as an assigned Princeton university project. It is being withdrawn since it needs to be changed and updated substantially.

This paper has been withdrawn by the authors.

The paper has been withdrawn.

This paper has been withdrawn due to that the same conclusion has been proposed before.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn.

The paper is withdrawn by the author due to a recently discovered flaw in a basic proof.

This paper has been withdrawn. See quant-ph/9806031 for a discussion.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author(s)

This paper has been withdrawn by the author

This paper has been withdrawn.

The paper is withdrawn. The proof has an error and it requires a different approach.