"It's very difficult to predict where and when these landslips are going to happen, " he said.
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Mr Colley described market conditions in the UK as "extremely challenging" and difficult to predict.
These longer-term effects are the ones that are most difficult to predict or prevent.
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How long the Apple dominance will roll on is difficult to predict for now.
But it is difficult to predict with much certainty what the Fed will do next.
But the special circumstances of the Provenge case make this decision difficult to predict.
Tony says it is difficult to predict stock market returns but relatively easy to predict volatility.
On the other hand, investing in all three of them makes it difficult to predict returns.
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Merrill Lynch automotive analyst John Murphy says it s difficult to predict the cost of Ford s buyout program.
"What the final outcome is going to be is difficult to predict, " says Forgacs.
However the effects of the mounting fears about the global economic hot spots are difficult to predict.
This, combined with an unusually large number of undecided voters, makes it difficult to predict the results.
It is difficult to predict what will prevail, but it is not an organizationally driven thing any more.
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Doctors say it's notoriously difficult to predict the outcome of neurological injuries, especially those stemming from oxygen deprivation.
But there is far more that, looking back, will have been very difficult to predict with much accuracy.
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That sort of development and transformation is difficult to predict, and largely irrelevant from an investing point of view.
The local impact on individual schools is going to be difficult to predict.
Whether or not Suharto's opponents will be able to gather any strength as a result is difficult to predict.
It may be difficult to predict how successful your idea will be and, if it is, how long that success will last.
In the fast-growing cholesterol market, it is difficult to predict which pills will be able to grow their sales fastest.
Yet even he concedes that these carbon nanomaterials are so complex that it is difficult to predict their properties theoretically.
The drug certainly seems to work in at least some patients, although it is difficult to predict who will benefit.
Without a catalyst like a notable surge in comparative-store sales, it may be difficult to predict the holiday sales environment.
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As well as their path, their forward motion, intensity and wind speed are all very difficult to predict, NOAA notes.
Aside from adding an ugly dimension to the charred economic landscape, its effects would also be widespread and difficult to predict.
That is difficult to predict, because current attitudes towards suicide are such an incoherent medley of views inherited from the past.
Based on this inconistency, the outcome of any antitrust challenge filed by Governor Corbett against the NCAA becomes difficult to predict.
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Despite the incredibly negative slant of much of Wednesday's questioning, it is difficult to predict how the panel will vote on Friday.
Because all these events are difficult to predict, whether the January barometer will hold up next year is a big question mark.
So it's really difficult to predict how this case could turn out.
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