There are four main types of threat that MI5 is on the lookout for.
Four main types of spending drive GDP, and each of the four is being held back.
There are two main types of US Savings Bonds: Series I and Series EE.
Instead, it attracts two main types of shoppers: the young and the economically desperate.
These cut-rate homes offer value for two main types of real estate investors: owner-occupants and distressed-property specialists.
Today, there are two main types of hackers, and only one is causing this kind of trouble.
The three main types of thin film technologies use cadmium-telluride, copper-indium-gallium-selenide and amorphous-silicon to convert sunlight into electricity.
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The company is made up of two main types of business - luxury goods and sports and lifestyle brands.
Not only are there two main types of creditors (banks and bondholders), but also several kinds of debtors (sovereign governments, banks and firms).
Conservatives usually argue two main types of imperfections in the system.
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He introduces the half-dozen main types of clouds as if they were his oldest friends: there is the towering, thunderous cumulonimbus, the beautiful cirrus, the fluffy, fine-weather cumulus.
One of the main complaints of genuinely rural types is that townies with weekend cottages not only force up the price of property, thus driving out the rural young, but also get away with paying only 50% of the standard council tax, on the grounds that they do not use local services as much as full-time residents.
In addition, to the five main categories there are other types of drugs that are subject to restrictions on their use.
The act's two main sections target vastly different types of behavior, though each may result in both civil liability and criminal punishment.
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One of the main goals of Energy Points is to help businesses compare different types of projects.
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Consumers see these two types of performance as the main responsibility of company chiefs until the end of the crisis, which we all know is some way away.
In the Lords, committee stage usually takes place in a committee of the whole House or in Grand Committee in the Moses Room, a large room away from the main Chamber, and rarely to other types of committee.
The main author of the San Diego report, Lori Eggert, says that the differences between the three types of elephants mean that conservationists need to be aware of varying levels of threat.
"In terms of long-term strength and the whole threat that we see of the ballistic Shahab missiles and other types of missiles from Iran, this is a main factor why we developed it and deployed it, " he said.
There are two types of investors out there: Wall Street and Main Street.
And besides, they say, the water from the Colorado River -- the city's main supply -- already has to be treated to remove all types of pollution.
Linda Griffith, a tissue engineer at MIT, said one of the main problems of the idea would be getting all the right cell types to grow in the right places.
The only difference between the two types of cyclooxygenase is a small pocket that protrudes, like the thumb of a glove, from the main binding site.
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