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This paper has been withdrawn by the author due to that the main results and approaches are closedly parallel to the ones in Lie algebra case.

The paper is withdrawn.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn by the authors; replaced by arXiv:0705.2531v2 [quant-ph].

This paper has been withdrawn by the author(s), due an error in the proof.

The paper was withdrawn because of its significant overlap with a paper appeared recently.

This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis. The consistent treatment is presented in the last publications of the author.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author. It will be replaced, substantially modified, by sections of the author's completed PhD thesis.

This paper has been withdrawn.

This paper has been withdrawn since it contains some discrepancy with othe authers's recent result. We will not post this until this discrepancy is resolved.

This paper has been withdrawn.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

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn.

This article has been withdrawn by the authors.