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This paper has been withdrawn by the authors since it was strongly elaborated, some new sections appeared. This made the paper significantly differ from current version. Besides two new authors participated in the work. So the authors…
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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.
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This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.
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WITHDRAWAL NOTICE This paper has been withdrawn by the authors as required by the American Journal of Sociology, which has accepted the paper for publication. AJS will not publish papers if the preprint remains posted on arXiv.
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