Dewi Davies, the national park's senior warden in northern Snowdonia, said disposing of their bodies was proving to be difficult because of the remote location.
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Rockefeller said that while more regulation of the industry is needed, achieving that will be difficult because of the industry's lobbying in Washington.
The Science of Success is short on concrete examples, and Koch acknowledges that implementing his Market Based Management can be difficult because of the hazy connection between, say, property rights and the day-to-day decisions of a midlevel manager in charge of a fertilizer plant.
"It's going to be difficult, of course, but we are never going to throw in the towel, " he said.
But he admitted that would be difficult because of the Afghan government's limited funds and because of widespread illiteracy in the country.
These calculations can be difficult because of uncertainty over exactly how much time an inmate had spent in police custody or on remand during a trial.
But getting a breakthrough will be difficult because of the ongoing violence here as well as the unpopularity of Bush, Israeli Prime Minister Ehud Olmert and Palestinian President Mahmoud Abbas.
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China has offered aid for regional energy, water and transport projects to the Southern African Development Community, but has pointedly said that implementation of the deal would be difficult while two of the community's members, Malawi and Swaziland, continued to recognise Taiwan.
Outside of China, it would be difficult for companies of this size and operating in basic industries to list, no matter how fast they are growing.
They may also just be difficult for the sake of being difficult.
Before the Middle East summit, Mr Bush will be in the French town of Evian for the G8 summit likely to be a difficult occasion because of recent strains in the transatlantic alliance.
Before the hearing, Michael Gallagher who lost his 21-year-old son, Aidan, in the bombing said victims' families needed time to "prepare for what will be some of the most difficult days of our lives".
We do know that given the scope of the disaster, it will be difficult for some period of time for Japanese consumers to contemplate shopping for luxury goods.
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With thousands of foreign journalists due to cover the Olympics in August, officials would have feared that any outbreak of unrest close to that date would be difficult to control because of intense media scrutiny.
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Given the sparse evidence, it will be difficult for any of them to find clear proof in the near future.
Travel around London is expected to be difficult and use of public transport is advised as many roads and bridges will be closed due to ongoing special events.
The report notes that the findings did not mean that the equipment did not exist or was not "being used usefully somewhere" - as it could be difficult keeping track of assets being used in war zones.
But because these results came from such small subsets of the study, it is still somewhat difficult to be sure of the results.
"I find the rationale behind some of the changes quite puzzling, and certainly it will be difficult to represent some of these communities who have no links in the past with each other, " said Mr Williams.
Furthermore, as a recent Institute of Medicine report makes clear, it will be difficult to gauge the magnitude of any effect and the mechanism responsible.
Gaining a spot in this year's New York marathon will be more difficult than usual because thousands of slots will be filled by runners displaced by last year's cancellation.
The next few weeks are likely to be equally difficult as a fewer number of stocks will be able to go up significantly if the overall market does correct more sharply.
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He also told Reuters that most of the weapons evidence has been found but that any further search would be much more difficult after control of the country is returned to Iraqis.
Reconciling those contradictions will be difficult in an atmosphere of increasingly divisive and partisan politics.
He asked reporters again to be aware of how difficult this has been for Lin's family.
Reforms to major institutions can be difficult, and dreams of grand sweeping changes are almost always Utopian.
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It means the condition can be difficult to get rid of and can affect patients again and again.
With the stage unavailable for other shows, the WMC says it may be difficult to achieve some of its business targets.
But it must be difficult for those members of her family and close associates to recognise the wife, mother and grandmother in the mythological figure.
"To achieve the same again will be very difficult, because of what happened last season Barcelona are the team everybody wants to beat and that will make our job very hard, " Toure added.
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