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This paper has been withdrawn by the author due a few mistakes in the paper.

This article has been withdrawn by arXiv admins due to excessive reuse of content from other authors. We also note that this article has been retracted from Physics Letters B at http://doi.org/10.1016/j.physletb.2015.03.024

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This paper has been withdrawn by the author due to an error in the computation of the central charge.

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This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.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This paper is withdrawn. The revised paper appears in chao-dyn/9904020