Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Recently, the Air Force refined its understanding of the core duties and responsibilities it performs as a Military Service Branch, streamlining what previously were six distinctive capabilities and seventeen operational functions into twelve core functions to be used across the doctrine, organization, training, equipment, leadership, and education, personnel, and facilities spectrum. These core functions express the ways in which the Air Force is particularly and appropriately suited to contribute to national security, but they do not necessarily express every aspect of what the Air Force contributes to the nation. It should be emphasized that the core functions, by themselves, are not doctrinal constructs.
What are not considered doctrinal constructs of the Air Force? 
A: core functions

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"We used a technique of laying our program out in general debate," he said. When we got to the amendment phase, we would offer our program as a substitute for the Johnson proposal. If we lost in the Committee of the Whole, then we would usually offer it as a motion to recommit and get a vote on that. And if we lost on the motion to recommit, our Republican members had a choice: They could vote against the Johnson program and say we did our best to come up with a better alternative. Or they could vote for it and make the same argument. Usually we lost; but when you're only 140 out of 435, you don't expect to win many.
How many amendments are usually passed in the committee of the Whole per year?
A: unanswerable

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Traditionally, major college basketball teams began their seasons with a few exhibition games. They played travelling teams made up of former college players on teams such as Athletes in Action or a team sponsored by Marathon Oil. On occasion before 1992, when FIBA allowed professional players on foreign national teams, colleges played those teams in exhibitions. However, in 2003, the National Collegiate Athletic Association banned games with non-college teams. Some teams have begun scheduling exhibition games against teams in NCAA Division II and NCAA Division III, or even against colleges and universities located in Canada. Major college basketball teams still travel to other countries during the summer to play in exhibition games, although a college team is allowed one foreign tour every four years, and a maximum of ten games in each tour.
How often does the NCAA allow college teams to go overseas?
A: one foreign tour every four years

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Jiangsu Province Kun Opera is one of the best theatres for Kunqu, China's oldest stage art. It is considered a conservative and traditional troupe. Nanjing also has professional opera troupes for the Yang, Yue (shaoxing), Xi and Jing (Chinese opera varieties) as well as Suzhou pingtan, spoken theatre and puppet theatre.
What other types of operas are performed in Nanjing?
A:
Yang, Yue (shaoxing), Xi and Jing