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End carry

If M? N, the sum will produce an end carry r(n) which is discarded, and what is left is the result M- N.

If M< N, the sum does not produce an end carry and is equal to r(n) - (N - M), which is the r's complement of (N - M). To obtain the answer in a familiar form, take the r's complement of the sum and place a negative sign in front.

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