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This paper has been removed by arXiv administrators because of overlap with gr-qc/9910015 and hep-th/0308070. It also has excessive overlap with the following papers also written by the authors or their collaborators: gr-qc/0509047,…

This paper has been withdrawn by the author(s). Please see arXiv:0711.3910 for revision.

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This submission has been withdrawn by arXiv admins because there was an erroneous author included in the original version.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author due to an error in the proof of Proposition 4.8.

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This paper has been withdrawn.

This paper has been withdrawn by the authors due to an error.

The paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a mistake in the proof of the main theorem.

This has been withdrawn by the author. A rewrite of some of the material is currently in progress.

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This paper has been withdrawn by the author, due to errors in the figures.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

This paper has been withdrawn by the author due to an error in the data-analysis.

This paper has been withdrawn. The authors realized that the obtained results were not new.

The author decided to withdraw this paper by 1) an error in Lemma 5.11 (and 5.12) which requires some justification; 2) the main result of this paper suffers overlap with arXiv:1203.5254; 3) the author decided to split arXiv:1203.5254 into…

The paper has been withdrawn by the authors for modification.