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unpublished; this paper has been withdrawn.

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The paper is withdrawn by the author because it is superseded by cond-mat/0303357 .

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This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

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This paper has been withdrawn: it does not evade the no-go results of Mayers, Lo and Chau, to whom I am most grateful for helpful correspondences.

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%auto-ignore The paper has been withdrawn by authors. The completely revised version can be found under the following preprint-no: hep-ph/9910282.

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