Related papers: Procrastinated Codes

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This paper has been withdrawn by the author(s).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

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This paper has been withdrawn by the authors due to some fatal errors in the analysis.

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This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.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This paper has been withdrawn by the author, since the author does not have enough time to answer every questions on this result.

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This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

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This paper was withdrawn on 20.11.97.

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This paper has been withdrawn by the author.