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This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the author due to similarity to the author's other paper

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This paper has been withdrawn since we combine this paper with math.AC/0503685. All contents of the paper have been moved to math.AC/0503685.

This paper has been withdrawn by the author due to a serious gap in the proof of the main theorem.

This paper has been withdrawn by the author due a few mistakes in the paper.

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This paper has been withdrawn by the authors due to its publication

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This paper has been withdrawn by the authors, due a crucial error.

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This paper has been withdrawn by the author

We show that the failure of the Delaney-Greer (DG) variational ansatz for transport demonstrated by us in Phys.\ Rev.\ B {\bf 80}, 165301 (2009) (I) is not related to an unsuitable constraint that prevents a broken time-reversal symmetry or…

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The paper has been withdrawn by authors. The issues studied in this paper were changed so much that we have published a new paper considering these issues. See hep-th/0406074

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This paper has been withdrawn by the authors, due an error in Bethe Ansatz equations (16).

This paper has been withdrawn by the author due to a crucial error in the submission action.