Question: For two numbers A=a3a2a1a0 and B=b3b2b1b0, use a few full adders, some gates, and one control wire (=1 means subtraction), to implement a circuit that

For two numbers A=a3a2a1a0 and B=b3b2b1b0, use a few full adders, some gates, and one control wire (=1 means subtraction), to implement a circuit that can do both addition and subtraction. Please construct a component to generate overflow too.

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