Question

Use contraction beginning with a 4-bit adder-subtractor with carry in, to design a 4-bit circuit without...

Use contraction beginning with a 4-bit adder-subtractor with carry in, to design a 4-bit circuit without carry out that increments its input by 0010 for input S=0 and decrements its input by 0010 for input S=1. Perform the design by designing the distinct 1-bit full adder cells needed and indicating the type of cell used in each of the four bit positions.

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