For if we cannot define what is to be allowed then we cannot write the regulations, can we?

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We cannot afford to write off vast swathes of the world as somehow marginal or irrelevant or doomed.

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We also all agree that George Osborne cannot write his first Budget until we have seen what we have inherited.

BBC: Peter Mandelson

As I write the US markets are not yet open so we cannot see the effect that the same news is having upon the Microsoft share price, nor that of Google.

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"We cannot accept that an average of three or four children in each class never learn to write at a level that enables them to go on to further education, " she said on Tuesday.

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Above all we cannot tell how the next Middle East generation - caricatured now as the Facebook revolutionaries - will write the story.

BBC: News - Today - The uncertain Arab summer