To know for certain whether praying for romantic partners strengthened relationships, they needed to go further.
Or to know for certain whether they can hang on to their beloved items.
He added that the midwife concerned could not know for certain who she had visited without the diaries.
By contrast, we know for certain what would happen to the fiscal situation.
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In the future, nobody will know for certain who knows what about them.
Nobody can know for certain what the ultimate effect of devolution will be.
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We know for certain that Maskhadov and his people are linked to terror.
There are two things we know for certain about past performance: First, past performance is no guarantee of future performance.
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The short answer is that no one can know for certain because statistics only tell a small part of the story.
Although it remains difficult to know for certain, I doubt that a suicide bomber was involved in the attack on me.
We don't know for certain whether the company just mismanaged its crisis handling or forged ahead knowing that problems were coming.
But even now, there are certain things that we know for certain.
We cannot know for certain because the administration will not discuss the specific cases, citing the need for secrecy in fighting terrorists.
All that we know for certain is that Stuxnet is a weapon and it is currently being used to wage a battle.
The scientists do not yet know for certain how the gene works.
Walgreen may not know for certain which plans are steering big orders to mail vendors, but says it will find out using internal sleuthing.
It will be years, though, before any applicants see the bulk of their money, or even know for certain how much they will get.
You can never know for certain in these situations, but Sullivan's staredown of Trotta may have been his last action ever as a professional footballer.
What we do know for certain is that there'll be two storage configurations -- 16GB and 32GB -- for the global unit's launch sometime this second quarter.
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It is impossible to know for certain Thunder assistant Mark Bryant says he wore thick-framed Cartier frames as a player in the 1990s but the lensless phenomenon is novel.
The only thing Russians know for certain about the many outrages they have suffered is that how and why they happened will never be known for certain.
If, in addition, you see his eyes open wider and his pupils dilate, you know for certain that he has a much greater interest in this particular option.
One thing we know for certain: the cost of capital in the private health insurance industry pales in comparison to the cost of capital raised by Uncle Sam.
"It might contain traces of horsemeat, but we don't know for certain at the moment if this is the case, " said Esther Filon, a spokeswoman for the Dutch food authority.
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But he warned that the industry does not yet know for certain the length of sewers being taken on or what condition they are in, so estimating costs is difficult.
Mr. Orefice says he didn't know for certain if the candidate was straight when he brought up the subject, but he turned out to be correct the candidate "would've been the odd man out, " he says.
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The researchers also stress that the figures they uncovered can only ever be an estimate - as they can never know for certain what percentage of those who took part actually stuck to the dice rules and answered truthfully.
While he conceded that the public could not know for certain whether the secrecy is due to phone intercept evidence, Mr Ryder called for an "urgent review" into the provision which prevents disclosure and discussion of telephone intercept evidence which he said was "exceptional".
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