And the first category identified is actually quite a sizeable one: the acquisition of private firms.
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Into the first category, selfless behaviour that is not, fall acts that invite or assume reciprocity.
Much of the knowledge, expertise and technology needed to understand business is channeled into the first category.
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For companies seeking local expertise, both firms said the first category is by far the most sought-after.
Among the items in the first category are more than a dozen Koran folios, all with exceptional calligraphy.
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Sometimes it was easy for those in the first category to forget about those in the second category.
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The first category of prayer comes out of the urgency of the Old Testament prophets and the Gospel itself.
The first category comprises the vast banks and transport, energy and telecoms providers that were, and to some extent still are, government ministries.
Small business owners most often fall into the first category, and yet we use social arguments against them as though they are in the second or third category.
Games emerged as the first category to really get traction.
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Universal health-care coverage belongs to the first category: you can pick one of several possible solutions, pass a bill, and (allowing for some tinkering around the edges) it will happen.
Sports was the first category we tackled.
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In the first category we're largely dealing with cars that are, in some way or another, powered by electricity, with the biggest example in the past being the Ford Focus Electric, which debuted at the show two years ago.
The police can have a difficult time differentiating between criminality, mob violence, and the first category of looting for actual need, which can in turn lead to police abuse and even the killing of innocent people, as in the case of Henry Glover.
Debut author Francesca Segal won the first novel category for The Innocents.
If Apple were to introduce iWatch, it will be the first new category of products under Tim Cook.
The first novel category sees former waitress Rachel Zadok nominated for Gem Squash Tokoloshe, about a young girl growing up during under apartheid in South Africa.
The possibilities for such technology is pretty much endless, but we'd say "nylon stocking that is also, conveniently, a computer" is the first product category worth felling.
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He notes that several years ago there had been speculation that ARM might make a dent in the netbook market, when the first entrants into the category chose to use Linux rather than Microsoft Windows to keep costs down.
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That was the first entry in the Bathroom category of my research files, which at the time were recorded with pen and paper.
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While the Challenger 300 was not the first super-midsize jet, it has dominated the category since it was first delivered in 2004.
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First, it will be the first new product category since Steve Jobs passed away.
Since the first introduction of the GALAXY Note category, Samsung has continued to enhance and expand the GALAXY Note product experiences.
Russia's own history, its heavy dependence on easily looted natural resources and the evidence so far all make it seem likely that the country will find itself in the second category, not the first.
It not only created the hand-held computer category and the first workable handwriting-recognition system, it also pioneered the whole idea of doing digital tasks -- including e-mail and Internet browsing -- on a device other than the PC.
Utilizing the Wii's controls in the first-person shooter category with skillful precision and creativity, Nintendo arguably has created the best game in the Metroid series.
And the U.S. Academy of Motion Picture Arts and Sciences is considering whether to nominate Nairobi Half Life for an Oscar in the Best Foreign Language Film category -- the first time a Kenyan movie has been considered.
The chief executives of Ford and Audi will speak at the show and connected home appliances will be highlighted as a CES category for the first time.
It said this error skewed the results - and the city's ranking in the murder category would fall from first to third if the correct population figures were used.
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