Related papers: Quantifying synergistic information remains an uns…

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This paper has been withdrawn since the results are not satisfied.

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This paper has been withdrawn by the author, since one of the key results duplicates existing work, as pointed out by a reader. I am currently revising the manuscript.

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The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968

This paper has been withdrawn by the author(s).The scheme presented is insecure.

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This paper has been withdrawn by the first author due to incomplete bibliography and incorporation of multiple formats in the same file.

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This paper has been withdrawn by the author due to a crucial sign error in equation 1

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This paper was withdrawn on 20.11.97.

This paper has been withdrawn by the author due to errors and bad formalization.

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This paper has been withdrawn, as all conjectures (and one claim) have been proven incorrect. Some of what remains may eventually reappear in a different context.