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Today, computer security comprises mainly "preventive" measures, like firewalls or an exit procedure. A firewall can be defined as a way of filtering network data between a host or a network and another network, such as the Internet, and can be implemented as software running on the machine, hooking into the network stack (or, in the case of most UNIX-based operating systems such as Linux, built into the operating system kernel) to provide real time filtering and blocking. Another implementation is a so-called physical firewall which consists of a separate machine filtering network traffic. Firewalls are common amongst machines that are permanently connected to the Internet.
Computer security is mostly comprised of what?
A: unanswerable

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With his third album, Graduation (2007), West moved away from the sound of his previous releases and towards a more atmospheric, rock-tinged, electronic-influenced soundscape. The musical evolution arose from him listening to music genres encompassing European Britpop and Euro-disco, American alternative and indie-rock, and his native Chicago house. Towards this end, West retracted much of the live instrumentation that characterized his previous album and replaced it with heavy, gothic synthesizers, distorted synth-chords, rave stabs, house beats, electro-disco rhythms, and a wide array of modulated electronic noises and digital audio-effects. In addition, West drew musical inspiration from arena rock bands such as The Rolling Stones, U2, and Led Zeppelin in terms of melody and chord progression.
Kanye drew inspiration from The Rolling Stones, U2, and Led Zeppelin in what ways?
A: melody and chord progression

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Located in the American South, Houston is a diverse city with a large and growing international community. The metropolitan area is home to an estimated 1.1 million (21.4 percent) residents who were born outside the United States, with nearly two-thirds of the area's foreign-born population from south of the United StatesMexico border. Additionally, more than one in five foreign-born residents are from Asia. The city is home to the nation's third-largest concentration of consular offices, representing 86 countries.
What percentage of Houston's foreign born population is from south of the U.S.-Mexican border?
A: two-thirds

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Slack (2003) compares three groups that conducted biological research at Yale during overlapping periods between 1910 and 1970. Yale proved important as a site for this research. The leaders of these groups were Ross Granville Harrison, Grace E. Pickford, and G. Evelyn Hutchinson, and their members included both graduate students and more experienced scientists. All produced innovative research, including the opening of new subfields in embryology, endocrinology, and ecology, respectively, over a long period of time. Harrison's group is shown to have been a classic research school; Pickford's and Hutchinson's were not. Pickford's group was successful in spite of her lack of departmental or institutional position or power. Hutchinson and his graduate and postgraduate students were extremely productive, but in diverse areas of ecology rather than one focused area of research or the use of one set of research tools. Hutchinson's example shows that new models for research groups are needed, especially for those that include extensive field research.
Which groups of researchers provided unorthodox structure for a research group?
A:
Pickford's and Hutchinson's