"When you sue people that you know are telling the truth, that is really difficult to forgive, " he said.
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"Linking all your employees is really difficult, " says Laura DeSoto, senior vice president of synergy and innovation at Experian.
"It is really difficult to say, " says Kathleen King, collections and science co-ordinator at Kew, where the specimens have been kept in unusually large pots for the first time.
"It is really difficult to track some of those down when all you have is a purported e-mail from somebody named Janet, and no other identifying information, " David Mikkelson said.
You see at Restaurant Med, where patrons only can speak to their wait staff about ingredients, and demand the modern but unhelpful ovens they heard about from friends and the media, it is really difficult to create meals that patrons thoroughly enjoy.
"Farmers are telling us that they have so many dead stock that they're struggling to get those animals collected, particularly in remote areas where driving to those farms with lorries to pick up the stock is really difficult, " she told BBC Radio Wales.
The accuracy of player evaluation and from a recruitment perspective the transferability of their skills into the Premier League is still really difficult because of the data that is available.
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Honestly, though, part of the problem for us is that free will is just really difficult for our algorithms to model.
"We as human beings are not genetically programmed to go backwards, so reversing in general is really quite difficult when you're learning to drive, " says Kevin Delaney, head of road safety at the Institute of Advanced Motorists.
Whether its bifurcation or rolling the ball back I don't know what the answer is, but the environmental question is really the one that is difficult for the manufacturers to refute.
Growing research from the neurosciences and cognitive sciences reveal that change really is difficult for humans.
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Is it really that difficult to imagine the economic carnage that would follow from raising their marginal rates?
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"It really is very difficult to manage for both doctor and patient, " says Jack Ansell, a professor of medicine at Boston University.
Ultimately, though, is it really a difficult question?
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"And, so, after decades and decades and decades of this, the notion that the Kurds, the Sunni Arabs, the Shia Arabs can sit down and work out some sort of compromise American style is really a very difficult proposition for them to undertake, " Krepinevich said.
But I would just say, again, our efforts are really working to help the Japanese people deal with what is a very difficult and really tragic situation.
Until Arena can really lay out all its data, it is going to be difficult to know how safe the drug really is.
In the books of Mr Lindon's authors life is never so secure: it is difficult to tell what is really happening and what is illusion.
"So, to miss out on this opportunity when the charities are having a really difficult time is immensely frustrating, " he said.
There is still and will continue to be quite a bit that B2B marketing functions do that is valuable, but still really difficult to measure in an attributable, CFO-acceptable way.
Many IT management techniques hold this out as a goal, but to really achieve this understanding is difficult.
In many families, if they are unemployed and something catastrophic happens, someone is diagnosed with cancer or some other really difficult disease, it can bring the family to bankruptcy.
So you have a two-tier financial system, and then you have a series of issues that I would put in a general label of market infrastructure--and this includes some really difficult issues: Accounting is a matter of great controversy.
It is difficult to tell where spending will really fall off.
What Andre finds really difficult are conversations where someone is disagreeing with him, conversations where he's being expected to talk about something that he finds difficult or uncomfortable or where he expects someone will disagree with him.
Not everyone is so fortunate, though, so what I really want to tell you about is philanthropy, an area far more difficult to excel in than stock picking.
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"While we appreciate that this is a very difficult decision for the league and owners, we hope it is understood that we really believe the time is now to bring the NBA back to Seattle, and that it is paramount that we do everything we can to put Seattle's best foot forward in this process, " Hansen said.
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