Input: Read this: The collateralized debt obligation in particular enabled financial institutions to obtain investor funds to finance subprime and other lending, extending or increasing the housing bubble and generating large fees. This essentially places cash payments from multiple mortgages or other debt obligations into a single pool from which specific securities draw in a specific sequence of priority. Those securities first in line received investment-grade ratings from rating agencies. Securities with lower priority had lower credit ratings but theoretically a higher rate of return on the amount invested.
Question: What securities had lower credit ratings but potentially a higher rate of return?

Output: Securities with lower priority


Input: Read this: Besides increased efficiency of power plants, there was an increase in efficiency (between 1950 and 1973) of the railway utilization of this electricity with energy-intensity dropping from 218 to 124 kwh/10,000 gross tonne-km (of both passenger and freight trains) or a 43% drop. Since energy-intensity is the inverse of energy-efficiency it drops as efficiency goes up. But most of this 43% decrease in energy-intensity also benefited diesel traction. The conversion of wheel bearings from plain to roller, increase of train weight, converting single track lines to double track (or partially double track), and the elimination of obsolete 2-axle freight cars increased the energy-efficiency of all types of traction: electric, diesel, and steam. However, there remained a 12–15% reduction of energy-intensity that only benefited electric traction (and not diesel). This was due to improvements in locomotives, more widespread use of regenerative braking (which in 1989 recycled 2.65% of the electric energy used for traction,) remote control of substations, better handling of the locomotive by the locomotive crew, and improvements in automation. Thus the overall efficiency of electric traction as compared to diesel more than doubled between 1950 and the mid-1970s in the Soviet Union. But after 1974 (thru 1980) there was no improvement in energy-intensity (wh/tonne-km) in part due to increasing speeds of passenger and freight trains.
Question: Elimination of what helped the efficiency of diesel traction to go up?

Output: 2-axle freight cars


Input: Read this: Possibly as early as the second century AD, Virgil's works were seen as having magical properties and were used for divination. In what became known as the Sortes Vergilianae (Virgilian Lots), passages would be selected at random and interpreted to answer questions. In the 12th century, starting around Naples but eventually spreading widely throughout Europe, a tradition developed in which Virgil was regarded as a great magician. Legends about Virgil and his magical powers remained popular for over two hundred years, arguably becoming as prominent as his writings themselves. Virgil's legacy in medieval Wales was such that the Welsh version of his name, Fferyllt or Pheryllt, became a generic term for magic-worker, and survives in the modern Welsh word for pharmacist, fferyllydd.
Question: Where did the tradition of seeing Virgil as a great magician last the longest?

Output: unanswerable


Input: Read this: Very low sounds are also produced in various species of Coleoptera, Hymenoptera, Lepidoptera, Mantodea and Neuroptera. These low sounds are simply the sounds made by the insect's movement. Through microscopic stridulatory structures located on the insect's muscles and joints, the normal sounds of the insect moving are amplified and can be used to warn or communicate with other insects. Most sound-making insects also have tympanal organs that can perceive airborne sounds. Some species in Hemiptera, such as the corixids (water boatmen), are known to communicate via underwater sounds. Most insects are also able to sense vibrations transmitted through surfaces.
Question: What sound volume is produced by Coleoptera?

Output:
low