7.6 A store has one express register and three regular ones. It is the store policy that the express register is open only when two or more of the other registers are busy. Assume that the boolean variables A, B, and C reflect the status of each of the regular registers (1 busy, 0 idle). Design the logic circuit, with A, B, and C as inputs and F as output, to automatically notify the manager (by setting F=l) to open the express register. Present two solutions, the first using only NAND gates, the second using only NOR gates.
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