Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The phenomenalist phase of post-Humean empiricism ended by the 1940s, for by that time it had become obvious that statements about physical things could not be translated into statements about actual and possible sense data. If a physical object statement is to be translatable into a sense-data statement, the former must be at least deducible from the latter. But it came to be realized that there is no finite set of statements about actual and possible sense-data from which we can deduce even a single physical-object statement. Remember that the translating or paraphrasing statement must be couched in terms of normal observers in normal conditions of observation. There is, however, no finite set of statements that are couched in purely sensory terms and can express the satisfaction of the condition of the presence of a normal observer. According to phenomenalism, to say that a normal observer is present is to make the hypothetical statement that were a doctor to inspect the observer, the observer would appear to the doctor to be normal. But, of course, the doctor himself must be a normal observer. If we are to specify this doctor's normality in sensory terms, we must make reference to a second doctor who, when inspecting the sense organs of the first doctor, would himself have to have the sense data a normal observer has when inspecting the sense organs of a subject who is a normal observer. And if we are to specify in sensory terms that the second doctor is a normal observer, we must refer to a third doctor, and so on (also see the third man).
How must a finite set of statements be described?
A: unanswerable

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Gaddafi's ideological worldview was moulded by his environment, namely his Islamic faith, his Bedouin upbringing, and his disgust at the actions of European colonialists in Libya. He was driven by a sense of "divine mission", believing himself a conduit of Allah's will, and thought that he must achieve his goals "no matter what the cost". Raised within the Sunni branch of Islam, Gaddafi called for the implementation of sharia within Libya. He desired unity across the Islamic world, and encouraged the propagation of the faith elsewhere. On a 2010 visit to Italy, he paid a modelling agency to find 200 young Italian women for a lecture he gave urging them to convert. He also funded the construction and renovation of two mosques in Africa, including Uganda's Kampala Mosque. He nevertheless clashed with conservative Libyan clerics as to his interpretation of Islam. Many criticised his attempts to encourage women to enter traditionally male-only sectors of society, such as the armed forces. Gaddafi was keen to improve women's status, though saw the sexes as "separate but equal" and therefore felt women should usually remain in traditional roles.
What variety of Islam was Gaddafi raised in?
A: Sunni

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After a trend of declining population density since World War II, the city has seen increased density in the inner and western suburbs, aided in part by Victorian Government planning, such as Postcode 3000 and Melbourne 2030 which have aimed to curtail urban sprawl. According to the Australian Bureau of Statistics as of June 2013, inner city Melbourne had the highest population density with 12,400 people per km2. Surrounding inner city suburbs experienced an increase in population density between 2012 and 2013; Carlton (9,000 people per km2) and Fitzroy (7,900).
How many people did Carlton have per km2 between 2012 and 2013?
A: 9,000

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The contracting parties' full names or sovereign titles are often included in the preamble, along with the full names and titles of their representatives, and a boilerplate clause about how their representatives have communicated (or exchanged) their full powers (i.e., the official documents appointing them to act on behalf of their respective states) and found them in good or proper form.
What are the official documents appointing a party's representative to act on their behalf?
A:
full powers