Related papers: Restricted centrosymmetric permutations

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This paper has been withdrawn since it was an inadvertant double submission. An updated version of the original submission can be found at quant-ph/0505131

This paper has been withdrawn by the author due to a crucial error.

The paper is withdrawn. The proof has an error and it requires a different approach.

This paper has been withdrawn because the models on which it was based have undergone significant changes and improvements. A new paper with the same title, based on the improved models, is accepted for publication in MNRAS and is available…

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This paper is removed from the network permanently. The content in this paper has now been put together with hep-th/9310183. See the recently replaced and widely revised version of the latter.

This paper has been withdrawn due to a crucial error in the proof of the main theorem