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This paper has been withdrawn by the author(s)

This paper has been withdrawn: it does not evade the no-go results of Mayers, Lo and Chau, to whom I am most grateful for helpful correspondences.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors, due to the discovery of paper 0201028 which predates it and contains most of it's results.

This paper has been withdrawn by the author due to the gaps in the proofs of Proposition 2.2 and Proposition 3.2

This paper has been withdrawn

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to some problems.

The paper has been withdrawn by the author.

This paper has been withdrawn by the author, due to errors in the figures.

This paper has been withdrawn by the author.

This paper has been withdrawn. A significantly revised version will be posted in the near future.

This paper has been withdrawn. Its new version has been published.

This paper was withdrawn (temporarily?) by the author since an error needs to be corrected.

This paper has been withdrawn by the author due to unspecified problems.

A modified version of this paper is under process and with a new title and abstract. Hence, this version of the article is completely withdrawn.

This paper has been withdrawn by the author. There is an error on page 3 in the last inequality before Lemma 1.1.

This paper has been withdrawn by the author due to a crucial sign error in some equations

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper is being withdrawn.