Taking advantage of those anomalies proved difficult at the height of the credit crunch.
Still, for all his social media savvy, mastering the BlackBerry has proved difficult for him.
But it proved difficult to get banks, transport operators, or even council departments on board.
Needlessly the Egyptian striker struck a backpass from the halfway line that proved difficult to clear for Robinson.
Enforcing the bargain, though, might have proved difficult since this will not (they hope) be a repeated game.
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It has previously proved difficult to prove national jurisdiction because pirate attacks usually take place in international waters.
Although outpatient treatment is modestly correlated with reduced recidivism, the efficacy of institution-based treatment has proved difficult to measure.
There have been one or two attempts, but full mergers have proved difficult.
Even getting the ID cards to everybody, as you know, proved difficult, because they were in those tented areas.
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This has proved difficult for the firm, which has already lost at least 67 partners amid internal fights over money.
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Such returns have proved difficult to maintain in the recent economic climate.
The embryonic stem cell research has also proved difficult, elusive for him.
As you can imagine, picking just 51 of those nominations proved difficult.
Thompson and Johnny McClune, another point scorer, controlled the midfield for long periods, but the Mayobridge defence proved difficult to break down.
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Some of those tough choices proved difficult to sustain over the years.
For the time being, production methods have proved difficult to scale up.
The US venture has proved difficult for the British supermarket chain - none of its nearly 300 stores have made a profit.
But the association ended after just one season which proved difficult for Spencer, despite becoming the second youngest winner of the Irish Flat jockey's crown.
Ideas were plentiful, but coming up with something that would pass safety standards so that people and seats wouldn't go flying in an accident proved difficult.
So even if Vale had found a target for a huge, transforming deal, Brazil's government, like Norway's footballers in 1998, would have proved difficult to beat.
Geron is hoping to use this technology not to copy whole animals, which has proved difficult and inefficient, but instead to create organs and cells for transplant.
But Petraeus' achievements proved difficult to replicate elsewhere in Iraq.
The European Central Bank (ECB) has been much slower to cut interest rates, in part because the tough inflation target it was set has proved difficult to meet.
But Junior ISAs have proved difficult sell for the government.
The terrain proved difficult for the army bomb disposal team - their first robot toppled over during a squall and a second vehicle was sent in to deal with the suspect device.
It has previously proved difficult to study telomerase in close detail because the enzyme tends to clump together outside of cells, preventing it from forming the ordered crystals necessary for structural analysis.
Getting the story straight in Shenandoah proved difficult.
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