Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The London Underground in England is one of the few networks that uses a four-rail system. The additional rail carries the electrical return that, on third rail and overhead networks, is provided by the running rails. On the London Underground, a top-contact third rail is beside the track, energized at +420v DC, and a top-contact fourth rail is located centrally between the running rails at 210v DC, which combine to provide a traction voltage of 630v DC. London Underground is now upgrading its fourth rail system to 750v DC with a positive conductor rail energised to +500v DC and a negative conductor rail energised to -250v DC. However, many older sections in tunnels are still energised to 630v DC. The same system was used for Milan's earliest underground line, Milan Metro's line 1, whose more recent lines use an overhead catenary or a third rail.
What type of system does London Underground use?
A: four-rail system

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Public education in Tajikistan consists of 11 years of primary and secondary education but the government has plans to implement a 12-year system in 2016. There is a relatively large number of tertiary education institutions including Khujand State University which has 76 departments in 15 faculties, Tajikistan State University of Law, Business, & Politics, Khorugh State University, Agricultural University of Tajikistan, Tajik State National University, and several other institutions. Most, but not all, universities were established during the Soviet Era. As of 2008[update] tertiary education enrollment was 17%, significantly below the sub-regional average of 37%. Many Tajiks left the education system due to low demand in the labor market for people with extensive educational training or professional skills.
What consists of 14 years of primary and secondary education?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Phase one mode is activated by a corresponding smoke sensor or heat sensor in the building. Once an alarm has been activated, the elevator will automatically go into phase one. The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the floor. Once the elevator has left the floor, depending on where the alarm was set off, the elevator will go to the fire-recall floor. However, if the alarm was activated on the fire-recall floor, the elevator will have an alternate floor to recall to. When the elevator is recalled, it proceeds to the recall floor and stops with its doors open. The elevator will no longer respond to calls or move in any direction. Located on the fire-recall floor is a fire-service key switch. The fire-service key switch has the ability to turn fire service off, turn fire service on or to bypass fire service. The only way to return the elevator to normal service is to switch it to bypass after the alarms have reset.
How is the elevator enabled for service after the incident?
A: The only way to return the elevator to normal service is to switch it to bypass after the alarms have reset

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
As the image of God grows within man, he learns to rely less on an intellectual pursuit of virtue and more on an affective pursuit of charity and meekness. Meekness and charity guide Christians to acknowledge that they are nothing without the One (God/Christ) who created them, sustains them, and guides them. Thus, man then directs his path to that One, and the love for, and of, Christ guides man's very nature to become centered on the One, and on his neighbor as well. Charity is the manifestation of the pure love of Christ, both for and by His follower.
Who do Christians not consider to the "One"?
A:
unanswerable