3 a). Draw a 4-bit Adder-Subtractor module with Overflow detection using Full Adders (FA) and XOR gates. Use FA symbols and XOR gates in your implementation and label all your wires with numerical subindexes. Ex. alo-3), bo-3), cino-3], couto-3], sumo-3). 3 b). Using your 4-bit Adder-Subtractor drawing, show the inputs and outputs values as well as the values of each wire when your module performs
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