Problem: An influential school of phonology in the interwar period was the Prague school. One of its leading members was Prince Nikolai Trubetzkoy, whose Grundzüge der Phonologie (Principles of Phonology), published posthumously in 1939, is among the most important works in the field from this period. Directly influenced by Baudouin de Courtenay, Trubetzkoy is considered the founder of morphophonology, although this concept had also been recognized by de Courtenay. Trubetzkoy also developed the concept of the archiphoneme. Another important figure in the Prague school was Roman Jakobson, who was one of the most prominent linguists of the 20th century.
What was Baudouin de Courtenay's publication?
---
Answer: unanswerable


Problem: In 1982, the US Mint began minting pennies coated in copper but made primarily of zinc. With the new zinc pennies, there is the potential for zinc toxicosis, which can be fatal. One reported case of chronic ingestion of 425 pennies (over 1 kg of zinc) resulted in death due to gastrointestinal bacterial and fungal sepsis, whereas another patient, who ingested 12 grams of zinc, only showed lethargy and ataxia (gross lack of coordination of muscle movements). Several other cases have been reported of humans suffering zinc intoxication by the ingestion of zinc coins.
What metal is no longer found in pennies?
---
Answer: unanswerable


Problem: The rapid development of religions in Zhejiang has driven the local committee of ethnic and religious affairs to enact measures to rationalise them in 2014, variously named "Three Rectifications and One Demolition" operations or "Special Treatment Work on Illegally Constructed Sites of Religious and Folk Religion Activities" according to the locality. These regulations have led to cases of demolition of churches and folk religion temples, or the removal of crosses from churches' roofs and spires. An exemplary case was that of the Sanjiang Church.
 What was not an exemplary case of all this?
---
Answer:
unanswerable