[Q]: Question: "What is a solution needed for?" Context: "The problem of the direction of time arises directly from two contradictory facts. Firstly, the fundamental physical laws are time-reversal invariant; if a cinematographic film were taken of any process describable by means of the aforementioned laws and then played backwards, it would still portray a physically possible process. Secondly, our experience of time, at the macroscopic level, is not time-reversal invariant. Glasses can fall and break, but shards of glass cannot reassemble and fly up onto tables. We have memories of the past, and none of the future. We feel we can't change the past but can influence the future." Answer:
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[A]: The problem

[Q]: Question: "Is the budget range of PlayStation 3 titles known in fewer regions as the Platinum or Greatest Hits range?" Context: "Sony have since launched their budget range of PlayStation 3 titles, known as the Greatest Hits range in North America, the Platinum range in Europe and Australia and The Best range in Japan. Among the titles available in the budget range include Resistance: Fall of Man, MotorStorm, Uncharted: Drakes Fortune, Rainbow Six: Vegas, Call Of Duty 3, Assassin's Creed and Ninja Gaiden Sigma. As of October 2009 Metal Gear Solid 4: Guns of the Patriots, Ratchet & Clank Future: Tools of Destruction, Devil May Cry 4, Army of Two, Battlefield: Bad Company and Midnight Club: Los Angeles have also joined the list." Answer:
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[A]: Greatest Hits

[Q]: Question: "what is the second type of natural formation mentioned?" Context: "On Earth, 99% of glacial ice is contained within vast ice sheets in the polar regions, but glaciers may be found in mountain ranges on every continent except Australia, and on a few high-latitude oceanic islands. Between 35N and 35S, glaciers occur only in the Himalayas, Andes, Rocky Mountains, a few high mountains in East Africa, Mexico, New Guinea and on Zard Kuh in Iran. Glaciers cover about 10 percent of Earth's land surface. Continental glaciers cover nearly 13,000,000 km2 (510^6 sq mi) or about 98 percent of Antarctica's 13,200,000 km2 (5.110^6 sq mi), with an average thickness of 2,100 m (7,000 ft). Greenland and Patagonia also have huge expanses of continental glaciers." Answer:
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[A]: vast ice sheets

[Q]: Question: "what was the last word in the passage?" Context: "Boston has been called the "Athens of America" for its literary culture, earning a reputation as "the intellectual capital of the United States." In the nineteenth century, Ralph Waldo Emerson, Henry David Thoreau, Nathaniel Hawthorne, Margaret Fuller, James Russell Lowell, and Henry Wadsworth Longfellow wrote in Boston. Some consider the Old Corner Bookstore, where these writers met and where The Atlantic Monthly was first published, to be "cradle of American literature. In 1852, the Boston Public Library was founded as the first free library in the United States. Boston's literary culture continues today thanks to the city's many universities and the Boston Book Festival." Answer:
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[A]:
Festival