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This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2073.

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This paper has been withdrawn by the author due to essential mistakes in some previous versions.

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This paper has been removed by arXiv administrators because it plagiarizes gr-qc/0404032 and others.

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This paper has been withdrawn by the authors after discussing its content with Dr. J. Madsen.

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This paper has been withdrawn by the author due to an extended and largely modified version of the paper was published in arXiv (see arXiv:0807.3694, Disjoint minimal graphs).

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This paper was withdrawn by arXiv administrators. It is an erroneous duplicate submission of math.NA/0405095.

This paper has been withdrawn by the authors, due to inappropriate discussions in Discussions.

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