Related papers: An unlikely result

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This paper has been withdrawn by the authors as they feel it inappropriate to publish this paper for the time being.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors because the results obtained have been reported earlier by other authors.

This paper has been withdrawn

This paper has been withdrawn by the author due to an error.

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This paper has been withdrawn by the author due to the presented idea is wrong.