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3. Design a calculator circuit which can perform either addition or subtraction on a 4-digit binary input and generate a 5-digit binary output. Your circuit

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3. Design a calculator circuit which can perform either addition or subtraction on a 4-digit binary input and generate a 5-digit binary output. Your circuit should let the user decide if the operation should be addition or subtraction. Note: you can re-use your parallel adder and parallel subtractor circuits generated for previous questions. (20 points)

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