Related papers: Lit-only sigma-game and its dual game

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There have been gaps found in the proofs. The paper is withdrawn until further notice.

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This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

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This paper was withdrawn on 20.11.97.

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This paper has been withdrawn by the author, due to two identical copies of the paper.

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Only craziness I am ashamed about.