Input: Read this: Roads in the US have been paved with materials that include asphalt/bitumen since at least 1870, when a street in front of the Newark, NJ City Hall was paved. In many cases, these early pavings were made from naturally occurring "bituminous rock", such as at Ritchie Mines in Macfarlan in Ritchie County, West Virginia from 1852 to 1873. In 1876, asphalt-based paving was used to pave Pennsylvania Avenue in Washington, DC, in time for the celebration of the national centennial. Asphalt/bitumen was also used for flooring, paving and waterproofing of baths and swimming pools during the early 20th century, following similar trends in Europe.
Question: What have been paved with asphalt since at least 1920?

Output: unanswerable

Input: Read this: Brasilia has also been the focus of modern-day literature. Published in 2008, The World In Grey: Dom Bosco's Prophecy, by author Ryan J. Lucero, tells an apocalypticle story based on the famous prophecy from the late 19th century by the Italian saint Don Bosco. According to Don Bosco's prophecy: "Between parallels 15 and 20, around a lake which shall be formed; A great civilization will thrive, and that will be the Promised Land." Brasilia lies between the parallels 15 S and 20 S, where an artificial lake (Paranoa Lake) was formed. Don Bosco is Brasilia's patron saint.
Question: What was the prophecy of Ryan J. Lucero?

Output: unanswerable

Input: Read this: Special units, such as KGr 100, became the Beleuchtergruppe (Firelighter Group), which used incendiaries and high explosive to mark the target area. The tactic was expanded into Feuerleitung (Blaze Control) with the creation of Brandbombenfelder (Incendiary Fields) to mark targets. These were marked out by parachute flares. Then bombers carrying SC 1000 (1,000 kg (2,205 lb)), SC 1400 (1,400 kg (3,086 lb)), and SC 1800 (1,800 kg (3,968 lb)) "Satan" bombs were used to level streets and residential areas. By December, the SC 2500 (2,500 kg (5,512 lb)) "Max" bomb was used.
Question: The Feuerleitung (Blaze Control) tactic led to what creation for marking targets?

Output: Brandbombenfelder (Incendiary Fields)

Input: Read this: Education in Eritrea is officially compulsory between seven and 13 years of age. However, the education infrastructure is inadequate to meet current needs. Statistics vary at the elementary level, suggesting that between 65 and 70% of school-aged children attend primary school; Approximately 61% attend secondary school. Student-teacher ratios are high: 45 to 1 at the elementary level and 54 to 1 at the secondary level. There are an average 63 students per classroom at the elementary level and 97 per classroom at the secondary level. Learning hours at school are often less than six hours per day. Skill shortages are present at all levels of the education system, and funding for and access to education vary significantly by gender and location. Illiteracy estimates for Eritrea range from around 40% to as high as 70%.
Question: What percentage of primary schools are open more than six hours per day?

Output:
unanswerable