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This paper has been withdrawn by the author due to text overlap with arXiv:1102.5004, as well as omission of proper citations to arXiv:1110.4655 and arXiv:1111.0313

This paper has been withdrawn by the authors, due to it's incompleteness.

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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

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The paper has been withdrawn due to numerical error.

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This paper has been withdrawn by the authors, because of serious experimental problems.

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The paper has been withdrawn by the authors