In a simple copy machine, a stop signal, S, is to be generated to stop the machine operation and energize an indicator light whenever either of the following conditions exists: (1) there is no paper in the paper feeder tray; or (2) the two micro-switches in the paper path are activated, indicating a jam in the paper path. The presence of paper in the feeder tray is indicated by a HIGH at logic signal P. Each of the micro-switches produces a logic signal (Q and R) that goes HIGH whenever paper is passing over the switch to activate it. Design and build the logic circuit to produce a HIGH at output signal S for the stated conditions, and implement it using the two-input NAND chip.

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