Analysts say surprisingly little is known about the workings of the two main groups.
The strategies are categorized into two main groups: Solar Radiation Management (SRM) and Carbon Dioxide Removal (CDR).
They will be dragged into what is sectarian divisiveness with many different factions among the three main groups.
CNN: Transcript of Thursday's Democratic presidential debate
Like cellphones, tablet plans fall into three main groups: prepaid, postpaid and contract-free.
In a separate development, one of the main groups fighting in northern Mali said it had split and wanted dialogue.
One of the main groups in this movement is the misnamed National Vaccine Information Center, which really should be called the Vaccine Misinformation Center.
In the weeks before the deadline, a rough consensus had emerged between two of the parliament's three main groups, the Shia Muslims and ethnic Kurds.
Punjab contains two main groups: most people speak Punjabi, some Seraiki.
Even the main groups are divided by differing ideologies and functions.
Pivot has identified two main groups within its prospective audience: cable TV subscribers who watch "television" across multiple platforms, and viewers who subscribe only to broadband.
The two other main groups are the 300, 000 or so Chinese (a tenth of them students) and the 225, 000 Brazilians (ethnic Japanese whose forebears emigrated to Brazil).
ECONOMIST: Social conventions and demography add to the sclerosis
Fearful that their candidates will be assassinated, most of the main groups are not disclosing most of the names on their slates, beyond a few well-known figures.
There are four main groups involved in health care.
ECONOMIST: California leads, but the rest of America is not far behind
Yin Gang, a Middle East analyst at the Chinese Academy of Social Sciences, says China's overarching objective in the region is to maintain friendly ties with its four main groups: Arabs, Turks, Persians and Jews.
ECONOMIST: China and the Middle East: Walking between the raindrops | The
And the main green groups have called an emergency joint congress for June 13th.
Its reforms are supported by the two main political groups, which between them take two-thirds of votes.
This time, the main paramilitary groups are on ceasefire and are signed up to the Good Friday agreement.
Of the main taxonomic groups (phyla), almost all are found in the oceans and half are exclusively marine.
Bahrain's four main opposition groups have grown louder in demanding constitutional reforms to curb the ruling Sunni family's powers.
Italy's three main labour groups jointly declared a general strike for next month.
Keen to restore securitisation's credibility, Wall Street's main trade groups, too, want the TALF opened up to smaller rating agencies.
Mr Abbas says he hopes a ceasefire agreement can soon be reached with Hamas, one of the main militant groups.
One of the main rebel groups fighting in the Niger Delta has called off its unilateral ceasefire, just weeks after announcing the truce.
ECONOMIST: A big rebel group in the Niger Delta calls off its ceasefire
When completed, this tree had sprouted branches representing all the main language groups in modern Europe: Romance, Celtic, Germanic, Slavic and so on.
He said the main supermarket groups have to make acquisitions in the convenience sector as it would take too long for them to grow organically.
About half of Americans -- 159 million -- fall into one of the five main target groups, including 102 million people aged 6 to 18.
While most of the main paramilitary groups have destroyed their weapons or at least begun the process, the INLA has not decommissioned any of its arms.
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