One person described the hacking as a swarm of relatively unsophisticated but persistent attempts to gain access.
It is a region of complex ethnic divisions, within and between republics, and of long-standing but persistent grudges and rivalries.
Since its launch, Netflix has been banking on a frustrating but persistent characteristic of the human mind: we are really bad forecasters.
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The acclaimed tenor Rolando Villazon had been scheduled to star in the role of Rodolfo, but persistent vocal problems forced him to withdraw.
Many governments were already on a heightened state of alert due to vague but persistent intelligence suggesting an attack may be imminent in Europe or elsewhere.
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But persistent rain had turned the pitch into a midweek lottery, with the players raising spray with every kick and passes stopping short of their targets with frustrating regularity.
The Saints stand-off missed another howler of a penalty attempt on 42 minutes, but persistent infringement by London Irish gave him another chance almost immediately, which he duly made good.
Former reporter Susan Yara took the Biophysical250 test after years of low-level but persistent digestive discomfort that was never accurately diagnosed, despite numerous tests for thyroid disorders and irritable bowel syndrome.
After he moved to Paris, he socialized mostly with his family and, since he was a suspicious man who suffered from a mild but persistent persecution complex, with a small circle of trusted associates.
The problems were subtle but persistent.
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To grasp the intellectual poverty that awaits us in a smart world, look no further than recent blueprints for a "smart kitchen" an odd but persistent goal of today's computer scientists, most recently in designs from the University of Washington and Kyoto Sangyo University in Japan.
But his persistent denials are leading some to think that he really does mean what he says.
Dru Sharpling, of the HMIC, said out-of-court disposals were a "useful tool" for new offenders, but not persistent offenders.
But another persistent fall in prices would be a sign of policy failure.
But the persistent proximity of digital cameras has made us much more indiscriminate about choosing which moments are worth recording.
Never pressing too hard but remaining persistent, he would talk about what a great addition Younkers' 50-store chain would be for Proffitt's.
But the persistent pandering to the coal sector there may be digging West Virginia in a hole from which it cannot emerge.
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But the persistent Anderson, who managed to find swing on a regular basis, caught the edge outside off-stump and Strauss pouched safely at first slip.
But one persistent problem with Wi-Fi has always been security.
But a persistent crime problem, made worse by staggering poverty, widespread unemployment and a failing school system, threatens to snuff out that recovery before it even takes root.
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But the persistent assault failed to dislodge the militants.
But being persistent does not necessarily mean being obnoxious.
For many cycling fans and observers of Mr. Armstrong, their biggest criticism of the fallen champion hasn't been his doping, but his persistent attacks of those who spoke the truth about doping or chose not to participate in doping.
But how could persistent use have a heightened impact on the teenage brain?
But it said persistent bad weather and low temperatures meant only half survived, while other rare birds including goshawks have also struggled.
But Puryear was persistent, meeting with Henry four times over six weeks.
The reason the detector is buried so deeply is to keep all but the most persistent of sub-atomic particles away from it.
They were set for their first rise three days, but it appears persistent fears about the China growth are weighing on the market.
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