Input: Elevator
When power is lost in a traction elevator system, all elevators will initially come to a halt. One by one, each car in the group will return to the lobby floor, open its doors and shut down. People in the remaining elevators may see an indicator light or hear a voice announcement informing them that the elevator will return to the lobby shortly. Once all cars have successfully returned, the system will then automatically select one or more cars to be used for normal operations and these cars will return to service. The car(s) selected to run under emergency power can be manually overridden by a key or strip switch in the lobby. In order to help prevent entrapment, when the system detects that it is running low on power, it will bring the running cars to the lobby or nearest floor, open the doors and shut down.

What is a safety feature to prevent entrapment?
Output: when the system detects that it is running low on power, it will bring the running cars to the lobby or nearest floor, open the doors and shut down

Input: Railway electrification system
To prevent the risk of out-of-phase supplies mixing, sections of line fed from different feeder stations must be kept strictly isolated. This is achieved by Neutral Sections (also known as Phase Breaks), usually provided at feeder stations and midway between them although, typically, only half are in use at any time, the others being provided to allow a feeder station to be shut down and power provided from adjacent feeder stations. Neutral Sections usually consist of an earthed section of wire which is separated from the live wires on either side by insulating material, typically ceramic beads, designed so that the pantograph will smoothly run from one section to the other. The earthed section prevents an arc being drawn from one live section to the other, as the voltage difference may be higher than the normal system voltage if the live sections are on different phases and the protective circuit breakers may not be able to safely interrupt the considerable current that would flow. To prevent the risk of an arc being drawn across from one section of wire to earth, when passing through the neutral section, the train must be coasting and the circuit breakers must be open. In many cases, this is done manually by the drivers. To help them, a warning board is provided just before both the neutral section and an advance warning some distance before. A further board is then provided after the neutral section to tell drivers to re-close the circuit breaker, although drivers must not do this until the rear pantograph has passed this board. In the UK, a system known as Automatic Power Control (APC) automatically opens and closes the circuit breaker, this being achieved by using sets of permanent magnets alongside the track communicating with a detector on the train. The only action needed by the driver is to shut off power and coast and therefore warning boards are still provided at and on the approach to neutral sections.

What should the driver do in order to open and close the circuit breaker?
Output: to shut off power and coast

Input: John, King of England
During the remainder of his reign, John focused on trying to retake Normandy. The available evidence suggests that John did not regard the loss of the Duchy as a permanent shift in Capetian power. Strategically, John faced several challenges: England itself had to be secured against possible French invasion, the sea-routes to Bordeaux needed to be secured following the loss of the land route to Aquitaine, and his remaining possessions in Aquitaine needed to be secured following the death of his mother, Eleanor, in April 1204. John's preferred plan was to use Poitou as a base of operations, advance up the Loire valley to threaten Paris, pin down the French forces and break Philip's internal lines of communication before landing a maritime force in the Duchy itself. Ideally, this plan would benefit from the opening of a second front on Philip's eastern frontiers with Flanders and Boulogne – effectively a re-creation of Richard's old strategy of applying pressure from Germany. All of this would require a great deal of money and soldiers.

John focused on trying to retake what?
Output: Normandy

Input: Daylight saving time
Opponents argue that actual energy savings are inconclusive, that DST increases health risks such as heart attack, that DST can disrupt morning activities, and that the act of changing clocks twice a year is economically and socially disruptive and cancels out any benefit. Farmers have tended to oppose DST.

What profession is more likely to want to repeal DST: farmers or shopkeepers?
Output:
Farmers