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The paper is being withdrawn since the results are incorporated in paper arxiv.org/abs/math.AG/0306195.

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This paper has been withdrawn by the authors due to numerical problems to get viable results.

This paper has been withdrawn by the authors due to new experimental results.

This paper has been withdrawn by the authors. There was an erroneous estimate of the degree of a transformed polynomial, making the method appear more effective than it really is. We thank an anonymous referee for pointing out this error.

This note is withdrawn. The result and its proof are available in the literature.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

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The paper is being withdrawn. A new submission will follow.

This paper is being withdrawn by the authors in order to correct some errors and also to introduce improved theoretical techniques.

This paper has been withdrawn because of serious errors.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdraw by the author due to adding more modeling results.

This paper has been withdrawn by the author.