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This paper has been withdrawn by the authors due to some errors.

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This paper has been withdrawn by the author due to the following reason. One of his(author) collaborator rightly claims that the idea of this work belongs not from the author, but from him (the collaborator).

This paper has been withdrawn by the author(s), see hep-th/0205152.

This paper has been withdrawn by the author because it needs a deep methodological revision.

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This paper has been withdrawn by the authors for future revision.

This paper has been withdrawn by the author due to the presented idea is wrong.

This paper have been withdraw by the autors, because of a too early submission.

This paper has been withdrawn by the author due to an error in the data-analysis.

It has been conjectured that the defocusing nonlinear Schr\"odinger (NLS) equation on the half-line does not admit solitons. We give a proof of this conjecture.

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This paper has been withdrawn by the author ali pourmohammad.

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This paper has been withdrawn.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