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This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

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This paper has been withdrawn by the author due to a crucial error in last part of proof.

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This paper has been withdrawn by the author due to some mistakes

This paper has been withdrawn by the author, due to a crucial error in the proof of Thm.1

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This paper has been withdrawn by the author, due to a crucial error in the proof of Lemma 3.1.

This paper has been withdrawn due to a photometric calibration error.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

This paper has been withdrawn due to an error, and no further revisions will be made.

This paper has being withdrawn by the authors due to an error in the conclusion.

This paper is withdrawn from submission due to a critical error in the proof of main theorem.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn due to an error in the proof of Theorem 5.3.

This paper has been withdrawn by the author due to a critical error in the proof of Theorem A pointed out by Burkhard Wilking.

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