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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Often they make it impossible for mothers with pushchairs, and often walking small children, to pass without dangerously going out into the road.
Without it, accurately selecting toolbar buttons and controls was often difficult and precisely wielding photo-editing tools was impossible.
Imagining a harrowing situation change for the better is often difficult, and at times impossible.
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Measuring both benefits and costs is often challenging if not impossible.
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Books and classes are often biased, making it impossible for women to have open, rational discussions with those responsible for their care.
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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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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Expanding distribution capacity is often impossible in crowded urban areas, and elsewhere people dislike new power lines.
Finding the actor and the motive behind a malicious hack is often a near-impossible feat of forensics.
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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.
Nuclear reactors, they say, often look great on paper, but are then plagued by practical difficulties and prove impossible to build on time or to budget.
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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.
As the back-to-school season kicks into high gear, the pressure and anxiety finally starts to subside for young people (and often their parents), who started this journey over a year ago, competing to beat seemingly impossible odds for a spot at a selective college.
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