Design a logic circuit that controls an elevator door in a three-story building. The circuit has four inputs. I is a logic signal that indicates when an elevator is moving (M=1) or stopped (M=0). F1, F2 and F3 re floor indicator signals that are normally LOW, and they go HIGH only when the elevator is ositioned at the level of that particular floor. For example, when the elevator is lined up level with e second floor, F2=1 and F1=F3=0. The circuit output is the OPEN signal which is normally LOW nd is to go HIGH when the elevator door is to be opened.

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