This is the most important rule, and yet it is the hardest one to quantify.
"We are pleased with the draw and it is not the hardest one we could have had, " said Hughes.
Coaches say the first college job is the hardest one to get.
The most interesting question and the one hardest to answer is not whether Labour will secure a third term it almost certainly will but what effect winning with around 35% of the vote would have on the government's and, above all, Tony Blair's legitimacy.
"The Gold Cup is the one everyone wants to win and it's one of the hardest - and we have had a few tries before, I think Chaplins Club finished second twice and fourth once, " said Chapman.
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This, allied to the fact that the Atlantic in mid-November is no place to be hanging around, with freezing water crashing all over the boats, makes the Transat one of the hardest races in the world.
What's certain is that the Sahara is one of the hardest places on earth for an outsider to understand.
For many priests, and those contemplating the priesthood, one of the hardest things about the ministry is the sheer loneliness of the job.
"The stark reality behind the statistics and one of the hardest things for victims' families to deal with is that drink driving does not happen by chance, " he said.
The radical anti-American Shiite cleric Muqtada al-Sadr is one of the most powerful people in Iraq, and one of the hardest to understand.
The black grouse is one of the hardest species to help because it has demanding habitat requirements.
Ms Needham said flying out to the island for the search was "one of the hardest things I've ever done".
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The auto industry has been on the rebound after being one of the hardest hit sectors during the financial crisis that put the global economy on its knees.
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The area near Cades Cove, an isolated valley that offers some of the best wildlife viewing opportunities in the park, was one of the hardest hit by the storm, Jones said.
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For the oenophile wanting a viticulturally inspired challenge, Naples throws up an interesting tussle, as its greatest culinary gift to the world, the pizza, is one of the hardest food and wine pairings to get right.
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Of course, not every day out of the office has to include one of the hardest climbs in cycling.
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The airline industry is notoriously one of the hardest to make money in.
As any actor will tell you, goodness, of all the character traits, is one of the hardest to make interesting.
The island's government has given the money to the international charity Oxfam which is working in the capital, Freetown, one of the hardest hit areas.
Likewise, the Yankees will have a difficult time finding someone who can and will assume all of the necessary responsibilities that accompany one of the hardest jobs in all of sports.
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She told viewers at the time that it was "one of the hardest decisions I've ever made".
Friday is the last day of campaigning in one of the hardest-fought Catalan elections since the restoration of democracy.
Cotterill, who joined the Magpies in February, said the decision to go was "one of the hardest of my career".
The unemployment rate in Clinton County, which contains Wilmington, is 15.8%, the highest in Ohio, itself one of the hardest-hit states.
Near the narrowest point, which is just four metres wide, intrepid climbers tackle the notoriously tough Hotel Supramonte, a near-vertical limestone cliff which towers 400m above the Gola Su Gorropu and is one of the hardest climbs on the island.
One of the first surveys since a Museum of Modern Art retrospective in 2005, this one dwells on many of the themes that have made Mr. Friedlander the jazziest street photographer since Henri Cartier-Bresson and, at the age of 77, still one of the hardest-working of his breed.
Mr Gill stayed in hospital with his wife and, with no other facilities available to him, had to sleep on the floor which he described as "one of the hardest night's sleep".
Russia, the fund's largest single borrower and one of the hardest hit by the Asian crisis, also recovered last year.
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