Keenan has told reporters he knows what he cannot say to his country's guests.
In the light of the ongoing police investigation, he cannot say any more.
It is because even if everything is going to plan in the best of all possible military plans, he cannot say much out loud about what the plan is.
McCafferty said he cannot say who shot that video.
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He wants to build a bridge over the Strait of Messina to Sicily, but his green allies say he cannot.
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Mr Ritter's critics - including the UK Foreign Office and US Secretary of State Madeleine Albright - say he cannot see the wider political context.
The attorney general has written to the mother of Hillsborough victim Kevin Williams to say he cannot fast-track a new inquest into her son's death.
But you cannot say he has been treated harshly, because people will look at his record, and it is impossible to argue against the fact that it was time for a change.
Also, a Saudi national with a leg wound was under guard at a Boston hospital in connection with the bombings, but investigators cannot say he is involved at this time and he is not in custody, a law enforcement official said Monday evening.
He will say that Labour cannot reverse every cut or tax rise (to claim otherwise would be absurd).
This, his aides say, means he cannot answer for the moment such niggling questions as whether he accepts the very concept of a two-state solution to the Israeli-Palestinian conflict.
But I have said this before, and I know, Iowa, you heard me say it: He cannot do this alone.
But I have said this before, and I will say it again -- he cannot do this alone.
But I have said this before, and I will say it again: He cannot do this alone.
But let me just tell you something -- and I have said this before and I will say it again -- he cannot do this alone.
He was so close to the victory that I cannot say I was the better player.
But I have said this before and I will say it again and again: He cannot do this alone.
"It looks very good that we come together (do a deal), it just takes a little bit of time because it's a situation where you cannot say yes or no immediately, " he said.
Some will say he didn't mention them because he cannot be sure of achieving either growth or deficit reduction in 2012.
The family of a man swept into the sea in Blackpool during gale-force winds say they "fear the worst" because he cannot swim.
But I have said it before and I will say it again and again and again: He cannot do this alone.
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Like Djorkaeff, he took a big decision during the winter break and we could say that he is a little bit disabled because he cannot play in Europe.
"It's very, very early in the process so we cannot say who they are or what the substance is, " he told Press Association.
Mr Assange's supporters have asked Sweden to guarantee that he would not be extradited to the US, which Swedish officials say they cannot legally do.
"I know lots of other soldiers have nothing good to say about the rehabilitation process but I cannot fault it, " he said.
If you cannot quite imagine Berlin posting to Twitter, then think how well he would put, say, Hannah Arendt in her place, on bloggingheads.tv.
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