Indeed, so vicious that it is often impossible to simply punish the cheater him or herself.
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But it is often impossible to obtain enough admissible evidence to obtain a conviction, the government argues.
Expanding distribution capacity is often impossible in crowded urban areas, and elsewhere people dislike new power lines.
Intelligence is a tough business: successes are often impossible to trumpet, but failures are all too evident.
These linkages are largely unknown and often impossible to observe, quantify and measure.
The necessary problem-solving skills are difficult to teach, and the experience is often impossible to acquire because so much is new.
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For a company approaching a bank for the first time, just finding the right department and the right people is a daunting, often impossible, task.
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These obligations are eating up vacation days and discretionary (and not-so discretionary) income, but it's often nearly impossible to say no.
The situation is further complicated by the fact that it often proves impossible to identify which particular condition a person is suffering from.
But that often proved impossible, either because a suspect could not be linked to a specific hostile country or because the ability to make that connection hinged on court-ordered surveillance.
Often they make it impossible for mothers with pushchairs, and often walking small children, to pass without dangerously going out into the road.
So African artists often find it impossible to tell their own stories.
Booking a complex itinerary online is often difficult or impossible.
Yet the real disadvantage of complexity in the international system is that it often makes it impossible for decision-makers to comprehend the challenges they face and to deal with them effectively.
Finding the actor and the motive behind a malicious hack is often a near-impossible feat of forensics.
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Achieving the elusive "work-life balance" can often feel like an impossible goal, especially for people who strive to give everything 100%.
Measuring both benefits and costs is often challenging if not impossible.
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The fact that Smith often makes his words impossible to hear correctly (even for natives of Salford, the Greater Manchester town that Smith is from) is something that only Smith can explain.
Ramezani used this measure to correct for the fact that high-growth companies also tend to collapse more often, making it impossible to compare portfolios with different growth characteristics over a number of years.
Books and classes are often biased, making it impossible for women to have open, rational discussions with those responsible for their care.
Imagining a harrowing situation change for the better is often difficult, and at times impossible.
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Too often, such information is nearly impossible to get, especially when it requires doctors to give patients useful statistics about things like treatment side effects.
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And anybody who has spent much time outside the United States, you just - it's impossible to overestimate how often this comes up in people's conversations about the United States now.
Hence, more often than not, arms control is impossible until it is unimportant.
For investors looking for alternatives to initial public offerings, which are nearly impossible to get, unpredictable and often disappointing, corporate spinoffs offer a smart and profitable opportunity.
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It adds that the data on serious adverse reactions in this kind of trial has not been properly collated, so that it has been impossible to say on past evidence how often they do go wrong.
Without it, accurately selecting toolbar buttons and controls was often difficult and precisely wielding photo-editing tools was impossible.
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