Russia's latest row with Georgia is not the only source of anxiety for its neighbours.
But the newcomers and the flowers are not the only source of all this misery.
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This matters, because bank credit is often the only source of finance for many firms.
When the bank was founded, it really was the only source of capital for many poor countries.
Fishermen say electronic navigation cannot be the only source of taking bearings for vessels approaching the coast.
BBC: NEWS | UK | England | Cornwall | Lighthouse switch-off considered
But, as the IMF figures have again reminded economists, America isn't the only source of bad news.
Gone are the days when the only source of sustenance for a vegetarian in Paris was a goat cheese salad.
The Olympic flame burning in a corner of the stadium seemed to be the only source of heat.
The only source of new money for stocks remains companies giving shareholders cash in exchange for their shares.
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Of course, Europe is not, as I said, the only source of concern when it comes to global growth.
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Growing differences between Muslims and Christians are not the only source of worry.
Germany and the European Central Bank (ECB) have ruled out the only source of unlimited support: the central bank itself.
Denials of exempt status are about the only source of humor to be found in the entire body of private letter rulings.
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The only source of kryptonite for shareholder activism is a truly dynamic, free thinking executive out of the mold of Henry Ford.
Fortunately, coffins are not the only source of new jobs in Lundazi.
This lowers the cost of models for niche markets, the only source of growth in saturated markets, such as Europe, America and Japan.
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Additionally, making the internet the only source for games would put a lot of pressure on both brick-and-mortar and online retailers that sell games.
But VAT is not the only source of potential discomfort in Lib Dem ranks, or possibly between Lib Dem ministers and their grassroots members.
In arid regions, in places feeling a need for the lack of water, underground water resources are often the only source of fresh water.
But it is also worth remembering that central banks are not the only source of money creation: commercial banks are normally much more important.
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"Such displays are typically the only source of visual content, so that the media experience is bounded by the bezel of the display, " it said.
He said its closure would hit "the only source of employment in the area, mainly local sand and gravel companies which traded with the Republic".
Surging exports, particularly to America, on the back of a sinking yen, have been almost the only source of economic growth in Japan this year.
The microtransactions are the only source of revenue for the game.
Next month's election is not the only source of political uncertainty.
One recent evening, almost the only source of light in the town's commercial district was Harry's Lobster House, which has been serving lobster bisque since 1933.
Radio 2 is not the only source of traffic bulletins, local radio also gives this service, and most car radios can automatically switch to traffic bulletins.
Apple has worked to persuade the major labels to drop DRM, though it still seeks to keep iTunes the only source of song downloads for the iPod.
Specialists were well aware that public funding was the only source of support for the early development of scientific and cultural knowledge, for fundamental experimentation, for breakthrough creativity.
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