No one knows for sure what would happen if there were no resolution by then.
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And no one knows for sure -- not even the dueling Upper West Side mothers.
Whether the bank is the next target of Wikileaks, no one knows for sure.
No one knows for sure -- but 30 years of research does offer some experience and insights.
No one knows for sure how many vases have been stolen, partly because the crime can go unnoticed.
But no one knows for sure, and they say the uncertainty is maddening.
The bottom line is that no one knows for sure if health reform will "bend the curve" of increasing medical spending.
No one knows for sure what the future holds, and as 2012 showed, market changes are often different than anyone expects.
The fact is, no one knows for sure how many of the genetic tests being pushed for various conditions are actually useful.
Beijing sees this, but no one knows for sure how clearly, and opinions differ widely depending on how many people you talk to.
Most historians agree that Polynesian seafarers arrived around 400 AD, but no one knows for sure -- some have posited an extraterrestrial connection.
No one knows for sure, which is why the National Institutes of Health (NIH) initiated a study in 2008 to compare the two drugs.
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Although the jury is still out and no one knows for sure, the competition is now being played out in construction sites all over the country.
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No one knows for sure what the effect will be with Oprah backing Obama because she has never thrown her full support behind a political candidate.
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No one knows for sure why an ancient people built the towering statues known as Moai, why they eventually turned on the Moai and tried to destroy them, or why their entire civilization became extinct.
At the moment, no one knows for sure where the bulk of the liability lay, but from many reports I have read it is BP that is more likely to bear the brunt of the costs.
There are new presidential elections in Russia next year, but so far no one knows for sure who is running, and against whom, and it seems that Medvedev and Prime Minister Vladimir Putin are focused on keeping elections backstage, with economic reforms center stage.
Here, about 30, 000 families (no one knows for sure how many) crowd into a warren of hastily thrown-together shacks on the fringes of Ghana's capital: there is no power, sewerage or running water, diarrhoea and other diseases are rife and deadly fires rapidly take hold.
No-one knows for sure but it seems likely that H1N1 escaped from a laboratory where it was being studied.
But no-one knows for sure what the consequences of a Greek exit would be, and whether it would prove to be significantly more expensive than the current path.
The club is reported to have had a maximum capacity of 2, 000 people, but no-one knows for sure how many people were inside at the time of the fire.
No-one knows for sure, but in his letter, Mr Chote makes clear that the OBR thinks the Eurozone and high energy prices have probably played the major role in growth turning out to be so feeble, not the planned austerity measures.
No-one knew - or still knows - for sure what caused the vessel to sink.
No one you ask in the softball world knows for sure what the secret 2005 vote was about.
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