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This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn as it has been superseded by postings arXiv:quant-ph/0702147 and arXiv:0712.2935

This paper has been withdrawn

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

The paper has been withdrawn by the author.

The paper has been withdrawn

This paper has been withdrawn by the author, as it is now incorporated in 0901.4506 (v4)

This paper had been withdrawed

This paper has been withdrawn by the author. The most updated version can be accessed by arXiv:1806.07290.

This paper has been withdrawn by the author(s)

This paper has been withdrawn by the author.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author due to an extended and largely modified version of the paper was published in arXiv (see arXiv:0807.3694, Disjoint minimal graphs).

This paper has been withdrawn by the author

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

The paper has been withdrawn.

This paper has been withdrawn by the authour.

This paper has been withdrawn by the author