Germany could go back to the deutschmark, but Greece cannot go back to the drachma.
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There is pressure for more cuts in interest rates but they cannot go much lower.
We are told that while states cannot go bankrupt but local municipalities can.
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But this cannot go on indefinitely and eventually consumers can either afford to buy no more or they must default.
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With no running water or toilets and not many berries, some have been trying to leave but cannot afford to go.
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At this level what we do is just respond to the complaints, investigate it and submit our report, but we cannot go and stop the fighting, no.
After all, runs the argument, you can take in a fake Paris or Venice after clearing the tables in Vegas, but you cannot then go and roast on a real beach.
Continued pressure requires continued build-up of military forces, but this clearly cannot go on for ever.
Mr. Bernanke is at best the man on the bobsled, he can steer it a bit right or left but he cannot make it go uphill.
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But the project cannot go ahead without UK government support.
This is partly because he doesn't go out on the pull, but also because he cannot trust people as they might go and sell the story.
If a newspaper refuses the council cannot punish it directly, but can go to court to ask for the paper to be fined.
Higher education cannot make college rankings go away, but increased transparency and cooperation could lead to rankings that better promote true academic quality than any that have come before.
"We were due to fly out of Krasnoyarsk by military cargo plane but because of the celebrations we cannot go until Thursday morning, " said Ms Daniels, from Whimple, Devon.
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To use a different metaphor, the Federal Reserve is like the team captain on a bobsleigh, he or she can turn the sleigh left or right a bit or put on and release the brakes, but he or she cannot make the sleigh go uphill.
We know we will miss him but you cannot stop a player who wants to go.
Winston Price, president-elect of the National Medical Association, an African-American physicians group, said that the current system--where patients might go to the doctor but then cannot afford drugs--is akin to sending people upstream in a canoe without a paddle.
Mr Westerwelle said Germany was in Afghanistan to defend its own security - "that is why this mission is right, but it is also right that it cannot go on forever", the Associated Press news agency reported him as saying.
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But there is no spot market: you cannot go to Toyota with your lanthanum and say, well, you use lanthanum in your batteries, buy mine!
"But as a human being I cannot tell them 'Go hungry' at a time when I am not able to provide them with jobs, " he says.
But if they cannot, Clinton should summon the will to go ahead without them.
But at least they may be realising that things cannot go on like this.
Earlier, pakistan's Supreme Court ruled Friday that the country's presidential elections can go ahead Saturday, but stipulated the results cannot be ratified until legal challenges are cleared.
It works both ways of course - why should a manager be able to walk out of his contract to go to another club when a player cannot - but the whole problem is that the contracts that managers sign are not worth the paper they are written on.
At the moment, Costco cannot buy directly from out-of-state vineyards, but must go through Washington's three-tier distribution system, complete with mandatory mark-ups.
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But until it is guaranteed the go-ahead, it cannot begin to recruit seriously.
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Look, it is not just their -- the strategy goes through -- and if you want to go through in some more detail -- but it cannot just be done purely by executive action.
But if they cannot make reasonable guesses as to when their drugs will go generic, it will slow their investment in new research, particularly in studies of medicines like Plavix or Lipitor that have been on the market for years.
Is Mr Barak saying what Mr Netanyahu cannot yet say but is, however reluctantly, preparing to say if the negotiations go well?
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