PROCEDURE : You are to design a 4-bit arithmetic unit that consists of a 4-bit adder/subtractor circuit. The arithmetic unit takes as inputs two 4-bit numbers (A and B) and one control input (M) add/subtract selector that selects the type of operation the unit will perform. When the input control is ‘0’, the input numbers are added. When it is set to ‘1’, the two input numbers are subtracted (A - B). TASK :: Two 4-bit Adder/Subtractor Circuit: Design and construct a 4-bit adder/subtractor circuit. DRAW THE CORRESPONDING LOGIC DIAGRAM OF THE CIRCUIT

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