And the synergy that looks good on paper is proving hard to put into practice.
Increased diversification of their economies away from oil is an obvious solution but one that is hard to achieve in practice.
That sounds good in theory but is hard to spot in practice.
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Yet by 1994, he was devoting so much time to his parents and their health problems that it was hard to maintain his practice.
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Yet by 1994, given all the time he was devoting to his parents and their health problems, he found it hard to maintain his practice.
The problem is that as there are relatively few heart transplants - just over 150 a year in the UK - it is hard to establish good practice guidelines.
In fighter pilot training school he had to practice twice as hard as others to master the same maneuvers.
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However, the cat (or, rather, subatomic particles that behave like the cat) has proved hard to hunt down in practice because such superpositions of states are fragile and easily disrupted phenomena.
To me, an ornate primping station seems a little, well, vain: delovely in theory but, like a certain over-the-top sequined dress that hangs unworn in my closet, hard to pull off in practice.
He also needs to grow up a little and learn to practice as hard as he plays, the Giants said.
"We worked very hard to integrate him into our practice and into our organization, and he adapted very well, was doing a really good job for us, " she said.
"His evaluation reports said that he had some difficulties in his residency, fitting into his residency, and we worked very hard to integrate him into our practice and into our organization, and he adapted very well, was doing a really good job for us, " she said.
Hard to imagine, yet common practice for millions of investors.
In practice, it is hard to parcel out the blame between technology and globalisation, because the two are so intertwined.
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In practice, it is hard to find buyers in this bracket who do not have lots of equity in their homes.
Sumrin Mudgil, 14, says it can be hard to balance her homework with so much practice, but she loves playing the sport especially the tournaments, which allow her to make friends across the country.
Because districts receive funds from so many disparate sources at the state, local, and federal level with various strings attached and all have different local political considerations at hand, in practice it is quite hard to predict demand.
Motwani, who is about to complete his MBA, admits that simultaneously studying and launching a business has been tough, but in other ways helpful in that he has been immediately able to translate business theory into hard practice.
In practice, this could be hard to achieve, but he has identified one principle.
All of this means that, for an outsider who observes even some dubious parenting practice, it can be hard to tell whether a relationship is actually abusive, or whether you've simply caught a family on a bad day.
"In practice, it's hard to simulate how tall they really are, " said Indiana's Jordan Hulls, a 6-foot senior who was at least 4 inches shorter than the players usually guarding him and went 0 for 6 on 3-point tries.
Another former U.K. rate-setter and arch-dove, David Blanchflower, has pointed out that even if nominal-GDP targeting was a good idea in theory, it is a bad idea in practice because nominal GDP is hard to measure and prone to large revisions.
In practice, however, it may be hard to achieve and the benefits may not be quite as obvious.
He also had a habit of reworking musical material, both his own and other people's, that some people found hard to stomach, though at the time it was common practice among musicians.
It would not be hard for an autistic individual to clock up that level of practice for the sort of skills, such as mathematical puzzles, that many neurotypicals would rapidly give up on.
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In practice, however, natural assets are often hard to price well or at all.
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In practice, says Mr Tubiana, it is hard to keep only the numbers and not also the content of the messages.
Supporting Lords reform in principle but holding it up in practice might become hard for Ed Miliband, the Labour leader, to explain.
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"This day of commissioning represents the culmination of months and years of hard work of training, trials and practice focussed on ensuring that Defender is ready to undertake operations around the world whenever tasked, " he added.
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