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This paper has been withdrawn by the author due to a mistake.

This paper has been withdrawn

This paper has been withdrawn by the authors due to an error in Section 7.

This paper has been withdrawn by the author due to a error in attachment of source file.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author, due a crucial mistake in proof of lemma 4.2.

This paper was withdrawn by the authors due an error in the elimination of the front in the linearized interior equations (28)-(29).

This paper has been withdrawn by the author due to a new work in [arXiv:0901.0456v4] which can contain the results in this paper.

This paper has been withdrawn by the author due to a mistake in the proof of the main theorem.

This paper has been withdrawn by the author due to the presented idea is wrong.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn, since it contains a corollary with impossible consequences and the source of an error is currently unknown.

This article has been withdrawn due to an error in a proof of the main result.

The paper has been withdrawn because the research work is still in progress.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the author

This paper has been withdrawn by the author due to an extended and largely modified version of the paper was published in arXiv (see arXiv:0807.3694, Disjoint minimal graphs).

This paper has been withdrawn by the author due to a misunderstanding about 3QBF.