We can speculate about the causes, but it's impossible to give a single definitive answer.
And those that did were so rare that they were practically impossible to find.
It is impossible to know when a society has reached a breaking point until it happens.
It is impossible to verify who precisely is driving the demand for Chinese consumer goods.
Cotton-industry officials say it is virtually impossible to tell organic cotton from the ordinary kind.
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Amidst such success, it is impossible to say how much more success could be achieved.
Governments are finding it almost impossible to monitor, let alone isolate, so many sources of infection.
That was during the dot-bust rollup, and I said it was impossible to do another Oracle.
But once the enterprise software is in the door it is almost impossible to extricate.
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It is therefore impossible to know who might take his place if he fell.
Each effort was like a stone added to a wall that looked increasingly impossible to breach.
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It is impossible to give a brief summary of what has happened in the eastern Congo?
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By their very nature it is impossible to know just how many are in place.
For many, it must feel impossible to know where to begin to carry on.
And it's almost impossible to say that there's no progress in Iraq in specific areas.
It is virtually impossible to do work on a problem without feeling that it is important.
However, being mostly Muslim and Malay, it was politically impossible to ignore their plight.
But that requires a kind of thoughtful compromise impossible to achieve given their mindset.
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It is impossible to be unmoved by these infants, said Saunders, the neonatal nurse practitioner.
But it is close to impossible to identify these advisers in advance, according to Mr. Tint.
Whether Cheney really believes the insurgents are on their last legs is impossible to tell.
Indeed, so vicious that it is often impossible to simply punish the cheater him or herself.
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This large space, littered with cut granite chunks of varying sizes, should be impossible to miss.
It is almost impossible to calculate what will happen if Europe is unable to save itself.
It's impossible to ignore the rain amid the partying and anticipation at Churchill Downs.
The implications of the way people vote are difficult, if not impossible to foresee.
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It was nearly impossible to assign a WNBA story to any of the top sports writers.
It is impossible to predict in advance who will benefit and who will not.
Of course, after the botched auction the heads were nearly impossible to sell anyway.
Chief executives understand that it is impossible to banish insider trading without crippling the markets themselves.
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