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This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.
This paper has been withdrawn by the author, due to a significant error in section 4.3.1.
This paper has been withdrawn by the author due to unspecified problems.
The paper was withdrawn by the author. Further research is needed.
This paper has been withdrawn by the author due to a crucial problem associated with Figs. 2 and 3.
This paper has been withdrawn because of serious errors.
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This paper has been withdrawn by the author.
This paper has been withdrawn by the author.
The paper has been withdrawn
This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.
This paper has been withdrawn by the author due to a crucial problem in Lemma 3. This equation must be changed.
This paper has been withdrawn by the author, due to errors in the figures.
This paper has been withdrawn by the author.
This paper has been withdrawn by the author.
This paper has been withdrawn at the author's request.
This paper has been withdrawn by the author, due to errors in the figures.
This paper has been withdrawn by the author.
This paper has been withdrawn by the authour.