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We would like to withdraw this article for the following reasons: 1 this article is not satisfactory for limited language and theoretical description; 2 we have enriched and revised this article with the help of other authors; 3 we must…

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This paper has been withdraw by the author due to adding more modeling results.

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This paper has been withdrawn by the author: it was a too preliminary version.

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This paper has been withdrawn by the authors. I will do the major revision.

This paper has been withdrawn by the authors. due fail of replacement of the paper. new version is hep-ph/0201214.

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WITHDRAWAL NOTICE This paper has been withdrawn by the authors as required by the American Journal of Sociology, which has accepted the paper for publication.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.

The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.

This paper has been withdrawn by the author.