Problem: Iranian languages:

Two of the earliest dialectal divisions among Iranian indeed happen to not follow the later division into Western and Eastern blocks. These concern the fate of the Proto-Indo-Iranian first-series palatal consonants, *ć and *dź:

What type of valves are c and dz?
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A: unanswerable


Problem: Korea was ruled by Japan from 1910 until the closing days of World War II. In August 1945, the Soviet Union declared war on Japan and—by agreement with the United States—occupied Korea north of the 38th parallel. U.S. forces subsequently occupied the south and Japan surrendered. By 1948, two separate governments had been set up. Both governments claimed to be the legitimate government of Korea, and neither side accepted the border as permanent. The conflict escalated into open warfare when North Korean forces—supported by the Soviet Union and China—invaded South Korea on 25 June 1950. On that day, the United Nations Security Council recognized this North Korean act as invasion and called for an immediate ceasefire. On 27 June, the Security Council adopted S/RES/83: Complaint of aggression upon the Republic of Korea and decided the formation and dispatch of the UN Forces in Korea. Twenty-one countries of the United Nations eventually contributed to the defense of South Korea, with the United States providing 88% of the UN's military personnel.
What part of Korea did the Soviet Union occupy?
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Answer: north of the 38th parallel


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A series of low-lying annexes (largely hidden) flank both ends. Also in the square are the glass-faced Planalto Palace housing the presidential offices, and the Palace of the Supreme Court. Farther east, on a triangle of land jutting into the lake, is the Palace of the Dawn (Palácio da Alvorada; the presidential residence). Between the federal and civic buildings on the Monumental Axis is the city's cathedral, considered by many to be Niemeyer's finest achievement (see photographs of the interior). The parabolically shaped structure is characterized by its 16 gracefully curving supports, which join in a circle 115 feet (35 meters) above the floor of the nave; stretched between the supports are translucent walls of tinted glass. The nave is entered via a subterranean passage rather than conventional doorways. Other notable buildings are Buriti Palace, Itamaraty Palace, the National Theater, and several foreign embassies that creatively embody features of their national architecture. The Brazilian landscape architect Roberto Burle Marx designed landmark modernist gardens for some of the principal buildings.
Where does Brazil's president live, in Portuguese?
A: Palácio da Alvorada


Context and question: As of 2005, there were over 50 churches recognized as cardinalatial deaconries, though there were only 30 cardinals of the order of deacons. Cardinal deacons have long enjoyed the right to "opt for the order of cardinal priests" (optazione) after they have been cardinal deacons for 10 years. They may on such elevation take a vacant "title" (a church allotted to a cardinal priest as the church in Rome with which he is associated) or their diaconal church may be temporarily elevated to a cardinal priest's "title" for that occasion. When elevated to cardinal priests, they take their precedence according to the day they were first made cardinal deacons (thus ranking above cardinal priests who were elevated to the college after them, regardless of order).
How many churches are recognized as cardinalatial deaconries in 2000?
Answer: unanswerable


Question: Many of the instruments used to perform medieval music still exist, but in different forms. Medieval instruments included the wood flute (which in the 21st century is made of metal), the recorder and plucked string instruments like the lute. As well, early versions of the organ, fiddle (or vielle), and trombone (called the sackbut) existed. Medieval instruments in Europe had most commonly been used singly, often self accompanied with a drone note, or occasionally in parts. From at least as early as the 13th century through the 15th century there was a division of instruments into haut (loud, shrill, outdoor instruments) and bas (quieter, more intimate instruments).
Is there an answer to this question: What was an early version of the fiddle called?

Answer: vielle


German beacons operated on the medium-frequency band and the signals involved a two-letter Morse identifier followed by a lengthy time-lapse which enabled the Luftwaffe crews to determine the signal's bearing. The Meacon system involved separate locations for a receiver with a directional aerial and a transmitter. The receipt of the German signal by the receiver was duly passed to the transmitter, the signal to be repeated. The action did not guarantee automatic success. If the German bomber flew closer to its own beam than the Meacon then the former signal would come through the stronger on the direction finder. The reverse would apply only if the meacon were closer.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The German beacons used what frequency band?
Ah, so..
medium