Problem: Russian Soviet Federative Socialist Republic:

After reconquering Estonia and Latvia in 1944, the Russian SFSR annexed their easternmost territories around Ivangorod and within the modern Pechorsky and Pytalovsky Districts in 1944-1945.

Near what town did the RSFSR leave territory in 1944?
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A: unanswerable

Problem: As of 2010[update], Bern had an unemployment rate of 3.3%. As of 2008[update], there were 259 people employed in the primary economic sector and about 59 businesses involved in this sector. 16,413 people were employed in the secondary sector and there were 950 businesses in this sector. 135,973 people were employed in the tertiary sector, with 7,654 businesses in this sector.
How many businesses are there in the tertiary sector?
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Answer: 7,654

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
On the following table, green arrows () represent an increase in ranking over the previous study, while red arrows () represent a decrease in ranking. They are followed by the number of spaces they moved. Blue dashes () represent a nation that did not move in the rankings since the previous study.
If a country's ranking does not change, which indicator will be present?
A: Blue dash

Context and question: The first department stores Lane Crawford was opened in 1850 by Scots Thomas Ash Lane and Ninian Crawford on Des Voeux Road, Hong Kong Island. At the beginning, the store mainly catered visiting ships' crews as well as British Navy staff and their families. In 1900, the first ethnic-Chinese owned Sincere Department Store was opened by Ma Ying Piu, who returned from Australia and inspired by David Jones. In 1907, another former Hong Kong expatriate in Australia, the Kwok's family, returned to Hong Kong and founded Wing On.
Who closed Lane Crawford?
Answer: unanswerable

Question: Although the Arenafootball2 league played its tenth season in 2009, a conference call in December 2008 resulted in enough votes from owners and cooperation from the AFLPA for the AFL to suspend the entire 2009 season in order to create "a long-term plan to improve its economic model". In doing so, the AFL became the second sports league to cancel an entire season, after the National Hockey League cancelled the 2004-05 season because of a lockout. The AFL also became the third sports league to lose its postseason (the first being Major League Baseball, which lost its postseason in 1994 because of a strike). Efforts to reformat the league's business model were placed under the leadership of Columbus Destroyers owner Jim Renacci and interim commissioner Policy.
Is there an answer to this question: In what month and year was it decided to suspend the 2009 Arena Football League season?

Answer: December 2008

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Proteins are structural materials in much of the animal body (e.g. muscles, skin, and hair). They also form the enzymes that control chemical reactions throughout the body. Each protein molecule is composed of amino acids, which are characterized by inclusion of nitrogen and sometimes sulphur (these components are responsible for the distinctive smell of burning protein, such as the keratin in hair). The body requires amino acids to produce new proteins (protein retention) and to replace damaged proteins (maintenance). As there is no protein or amino acid storage provision, amino acids must be present in the diet. Excess amino acids are discarded, typically in the urine. For all animals, some amino acids are essential (an animal cannot produce them internally) and some are non-essential (the animal can produce them from other nitrogen-containing compounds). About twenty amino acids are found in the human body, and about ten of these are essential and, therefore, must be included in the diet. A diet that contains adequate amounts of amino acids (especially those that are essential) is particularly important in some situations: during early development and maturation, pregnancy, lactation, or injury (a burn, for instance). A complete protein source contains all the essential amino acids; an incomplete protein source lacks one or more of the essential amino acids.
Approximately how many amino acid types does the human body generally have?
A:
twenty