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This paper was withdrawn on 20.11.97.

This paper has been withdrawn

This paper has been withdrawn.

The paper has been withdrawn

This paper has been withdrawn.

This paper has been withdrawn by the authour.

This paper has been withdrawn

This paper has been withdrawn.

This paper was withdrawn on 20.11.97.

This paper has been withdrawn by the author.

This paper has been retracted, for obvious reasons.

This paper has been withdrawn as it has been superseded by postings arXiv:quant-ph/0702147 and arXiv:0712.2935

This paper has been withdrawn by the author.