Problem: Qing dynasty:

Li Zicheng then led a coalition of rebel forces numbering 200,000[a] to confront Wu Sangui, the general commanding the Ming garrison at Shanhai Pass. Shanhai Pass is a pivotal pass of the Great Wall, located fifty miles northeast of Beijing, and for years its defenses kept the Manchus from directly raiding the Ming capital. Wu Sangui, caught between a rebel army twice his size and a foreign enemy he had fought for years, decided to cast his lot with the Manchus, with whom he was familiar. Wu Sangui may have been influenced by Li Zicheng's mistreatment of his family and other wealthy and cultured officials; it was said that Li also took Wu's concubine Chen Yuanyuan for himself. Wu and Dorgon allied in the name of avenging the death of the Chongzhen Emperor. Together, the two former enemies met and defeated Li Zicheng's rebel forces in battle on May 27, 1644.

When did the battle take place?
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A: May 27, 1644


Problem: Interpreters have sometimes played crucial roles in history. A prime example is La Malinche, also known as Malintzin, Malinalli and Doña Marina, an early-16th-century Nahua woman from the Mexican Gulf Coast. As a child she had been sold or given to Maya slave-traders from Xicalango, and thus had become bilingual. Subsequently given along with other women to the invading Spaniards, she became instrumental in the Spanish conquest of Mexico, acting as interpreter, adviser, intermediary and lover to Hernán Cortés.
What region did La Malinche refuse to visit?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The GDP of Thuringia is below the national average, in line with the other former East German Lands. Until 2004, Thuringia was one of the weakest regions within the European Union. The accession of several new countries, the crisis in southern Europe and the sustained economic growth in Germany since 2005 has brought the Thuringian GDP close to the EU average since then. The high economic subsidies granted by the federal government and the EU after 1990 are being reduced gradually and will end around 2020.
For how long was Thuringia one of the weakest regions in the EU?
A: Until 2004


Context and question: Attestations of Old Dutch sentences are extremely rare. The oldest one first recorded has been found in the Salic law. From this Frankish document written around 510 the oldest sentence has been identified as Dutch: Maltho thi afrio lito (I say to you, I free you, serf) used to free a serf. Another old fragment of Dutch is Visc flot aftar themo uuatare (A fish was swimming in the water). The oldest conserved larger Dutch text is the Utrecht baptismal vow (776-800) starting with Forsachistu diobolae [...] ec forsacho diabolae (Do you forsake the devil? [...] I forsake the devil). Probably the most famous sentence Hebban olla vogala nestas hagunnan, hinase hic enda tu, wat unbidan we nu (All birds have started making nests, except me and you, what are we waiting for), is dated around the year 1100, written by a Flemish monk in a convent in Rochester, England.
Are written records of Old Dutch rare or common?
Answer: rare


Question: Very few early Byzantine mosaics survived the Iconoclastic destruction of the 8th century. Among the rare examples are the 6th-century Christ in majesty (or Ezekiel's Vision) mosaic in the apse of the Church of Hosios David in Thessaloniki that was hidden behind mortar during those dangerous times. Nine mosaic panels in the Hagios Demetrios Church, which were made between 634 and 730, also escaped destruction. Unusually almost all represent Saint Demetrius of Thessaloniki, often with suppliants before him.
Is there an answer to this question: How many Byzantine mosaics survived past the 8th century?

Answer: Very few


Problem: BeiDou Navigation Satellite System:

Compass-M1 transmits in 3 bands: E2, E5B, and E6. In each frequency band two coherent sub-signals have been detected with a phase shift of 90 degrees (in quadrature). These signal components are further referred to as "I" and "Q". The "I" components have shorter codes and are likely to be intended for the open service. The "Q" components have much longer codes, are more interference resistive, and are probably intended for the restricted service. IQ modulation has been the method in both wired and wireless digital modulation since morsetting carrier signal 100 years ago.

Which components have much shorter codes and are most likely intended for the restricted service?
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A:
unanswerable