Related papers: A Fast Combined Decimal Adder/Subtractor

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This paper has been withdrawn. The contents of this paper can now be found in 0907.3000, which combines the erstwhile 0901.2981 and 0901.2982 in a somewhat compact form.

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This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

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This paper has been withdrawn by the author, since one of the key results duplicates existing work, as pointed out by a reader. I am currently revising the manuscript.

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