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This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn

This paper has been withdrawn by the author due to the incorrect argument for the security.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn by the author, due an error in claim 1.

This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn

This paper has been withdrawn while the author verifies the literature.

This paper was withdrawn by the author.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

This paper has been withdrawn by the authors

This paper has been withdrawn by the author.

This paper has been withdrawn by the author because it has been substantially modified.

This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author. It will be replaced, substantially modified, by sections of the author's completed PhD thesis.