To make this case in any courtroom would be very difficult for a prosecutor -- who point out that it is difficult, if not impossible, to put on a successful prosecution if the chief witness is deemed by the prosecutors to be unreliable on some issues, but presented as totally truthful on others.
The implications of the way people vote are difficult, if not impossible to foresee.
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Change would be difficult, if not impossible, for processes locked into traditional on-site IT systems.
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This film would have been hard, if not impossible, to make just a few years ago.
Unison said it was "unlikely if not impossible for Circle to pay it back".
Trying to make nanowires like this using human-engineered manufacturing processes would be expensive, if not impossible.
It will be hard, if not impossible, to fathom the Sunni Arabs' electoral wishes.
In the meantime, figuring out exactly how big a seller Zetia will be is difficult if not impossible.
Replacing so much lost capacity on the front end with renewable sources would be difficult if not impossible.
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In other words, it's tough, if not impossible, to tell that it's a co-op simply by looking at it.
This may be very significant if it is difficult, if not impossible, to determine status based on other facts.
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It's also difficult if not impossible to renegotiate these loans once they're set.
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Such a move would render it difficult if not impossible for Israel to conduct counterterror operations within those temporary borders.
Partners, looking to work with the slow-moving carrier, also found it difficult, if not impossible, to get in the door.
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It also is incredibly difficult, if not impossible, for founders to obtain temporary H-1B visas for their own prospective startups.
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Yet without a unified Palestinian front it will be hard, if not impossible, for Israel to negotiate a peace that might endure.
Moreover, it would be difficult, if not impossible, to convince Congress to support new spending programs in this time of budget deficits.
But it will be difficult, if not impossible, according to Richard Armitage, a former deputy secretary of state in the Bush administration.
However, there is also the potential that state standards will conflict, putting producers and manufacturers in a difficult if not impossible position.
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But it will be a hard, if not impossible, balance to strike.
Mr Berlusconi and his allies are hoping to win enough Senate seats to make life difficult if not impossible for any Bersani-led government.
One is that the thing that makes economic forecasting difficult, if not impossible, is the sheer complexity and variability of the relationships involved.
Parenting in a post-Facebook era where a new, must-have, social media app is churned out every two minutes makes monitoring exhausting, if not impossible.
And you get now to the point where revenues for all municipalities are squeezed, and keeping those promises is exceedingly difficult, if not impossible.
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The society said it required solicitors for both the buyer and seller to grant undertakings which may be difficult, if not impossible, to honour.
Are you concerned that the U.S. would find it difficult, if not impossible, to replicate the military force brought to bear in Desert Storm?
If a would-be abductor attempts to grab a child off a bike, the child can "hug" the bicycle, making abduction difficult, if not impossible.
And experts say it's a problem that can't easily be solved by new laws because proving sleepiness behind the wheel is difficult, if not impossible.
This would mean that income splitting is difficult if not impossible and it would certainly make delaying the recognition of income for tax purposes impossible.
Those deals might be benign or they might include provisions that will make it difficult, if not impossible, for competing services to effectively challenge iCloud.
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