Input: Read this: Combined with this influx of classical ideas was the invention of printing which facilitated dissemination of the printed word and democratized learning. These two things would later lead to the Protestant Reformation. Toward the end of the period, an era of discovery began (Age of Discovery). The rise of the Ottoman Empire, culminating in the Fall of Constantinople in 1453, eroded the last remnants of the Byzantine Empire and cut off trading possibilities with the east. Europeans were forced to seek new trading routes, leading to the expedition of Columbus to the Americas in 1492, and Vasco da Gama's circumnavigation of India and Africa in 1498. Their discoveries strengthened the economy and power of European nations.
Question: In what year did Vasco da Gama sail through India and Africa?

Output: unanswerable

Input: Read this: The influence of Nasser's Arab nationalism over the RCC was immediately apparent. The administration was instantly recognized by the neighbouring Arab nationalist regimes in Egypt, Syria, Iraq and Sudan, with Egypt sending experts to aid the inexperienced RCC. Gaddafi propounded Pan-Arab ideas, proclaiming the need for a single Arab state stretching across North Africa and the Middle East. In December 1969, Libya founded the Arab Revolutionary Front with Egypt and Sudan as a step towards political unification, and in 1970 Syria stated its intention to join.
Question: What countries founded the Arab Revolutionary Front with Libya?

Output: Egypt and Sudan

Input: Read this: In the 1990s Rhino Records issued a series of boxed sets of 78 rpm reissues of early rock and roll hits, intended for owners of vintage jukeboxes. This was a disaster because Rhino did not warn customers that their records were made of vinyl, and that the vintage 78 RPM juke boxes were designed with heavy tone arms and steel needles to play the hard shellac records of their time. This failure to warn customers gave the Rhino 78 records a bad reputation,[citation needed] as they were destroyed by old juke boxes and old record players but played very well on newer 78-capable turntables with modern lightweight tone arms and jewel needles.
Question: When was the release by Rhino Records of 78 rpm for jukebox owners?

Output: 1990s

Input: Read this: When Empress Dowager Deng died, Emperor An (r. 106125 AD) was convinced by the accusations of the eunuchs Li Run () and Jiang Jing () that Deng and her family had planned to depose him. An dismissed Deng's clan members from office, exiled them and forced many to commit suicide. After An's death, his wife, Empress Dowager Yan (d. 126 AD) placed the child Marquess of Beixiang on the throne in an attempt to retain power within her family. However, palace eunuch Sun Cheng (d. 132 AD) masterminded a successful overthrow of her regime to enthrone Emperor Shun of Han (r. 125144 AD). Yan was placed under house arrest, her relatives were either killed or exiled, and her eunuch allies were slaughtered. The regent Liang Ji (d. 159 AD), brother of Empress Liang Na (d. 150 AD), had the brother-in-law of Consort Deng Mengnu (later empress) (d. 165 AD) killed after Deng Mengnu resisted Liang Ji's attempts to control her. Afterward, Emperor Huan employed eunuchs to depose Liang Ji, who was then forced to commit suicide.
Question: Which person plotted to overthrew the regime of Empress Dowager Yan?

Output:
Sun Cheng