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This paper has been withdrawn by the author due to the incorrect argument for the security.

The paper has been withdrawn by the author due to a crucial error.

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This paper has been withdrawn, as it has been merged into arXiv:1009.6144

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Paper withdrawn by author. New treatment is in preparation.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

The paper has been withdrawn by the author, due to a critical error stemming from the defined template.

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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

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