So the problem is how to facilitate this, given that it is not practical to put them in a scanner every time someone wants to ask them a question.
Hence his commission which is concluding, to no great surprise, that it is not practical simply to exclude one category of MP, the Scots, from all Parliamentary votes affecting England.
For many people, long queues or long journeys means it is only practical to do this online.
Since it is not practical to have a physically-backed crude oil fund, existing products rely on futures contracts to implement their strategies.
It is not a practical option to have rationing of care because there is no medical test for impotence and therefore it would be almost impossible to apply fair and consistent criteria for treatment across the board.
It is just not practical to deport 11 million undocumented immigrants living within our borders.
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As broadband Internet access becomes widely available over the next 18 months, difficult decisions must be taken about whether it is right or practical to try to extend regulations designed for conventional television channels to on-demand content aggregated on new portals.
To the practical administrator it is false to make a sharp division where independence falls.
Maybe this is eminently practical, but it is impossible to enforce without a ton of litigation.
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Maillechort is more practical in that it is far more resistant to corrosion, but it is also a much more demanding material to work with, as it scratches easily and stains even more so if mishandled during assembly.
It is impossible as a practical matter to provide for separation of the sexes in frontline positions.
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And this is not blind optimism or synthetic confidence to console people, it is the practical affirmation for our times of our faith in a better future.
Though the temperature at which this effect occurs is too low for it to have any obvious practical consequences for the operation of computer chips, it is hot stuff for the theorists.
It is arguably the first serious practical attempt to deal with the various problems America faces.
As a practical matter, it is difficult to get thirty countries to agree what day of the week it is.
Pakistan has also tried to demonstrate how important it is to America in more practical ways than just its diplomatic sulk.
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Mr Grubb shows why it is right to be concerned about such practical difficulties but also why they do not undermine the success of the Kyoto accord, which they take to be one of the great negotiating successes of the past half-century.
But it is likely to be many years before the infrastructure is in place to make these cars practical.
This may be because it is their only practical option: patents are costly to get and often provide only weak protection.
When the questions erupted - is it remotely practical, can any port be home to liquefied natural gas, oil refineries and nuclear submarines, how many jobs would come to Wales, was he serious?
Two parts provide a practical guide to what the EU thinks it is doing now, and what the German government (at least) hopes it will do next.
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But it may help to write an instant obituary that at least mentions some practical and theoretical reasons why their report is likely to be dead on arrival.
But as a practical matter, it is impossible for a health professional to ascertain conclusively whether or not a patient is suffering from back pains or sad feelings.
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This raises a very practical question: Is it physically possible for K2 Global to investigate and monitor so many entities (multiple entities may be involved in a single structured finance deal).
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Yevgenia Yuvcief (ph) of the Moscow Carnegie Center says even if Moscow is motivated by showing up the west, its dialogue with Iran is more practical than western attempts to isolate it.
It is just these practical considerations which Becta did not give enough weight to.
"The only way we resolve it is by having the right vision, and then the practical measures to achieve it, " Blair said.
And is it even, as a practical matter, possible for planes to be held at gates until all the people who can weigh in on this do weigh in?
Last week, three big oil companies, including Chevron, said it could be practical to develop a massive oil field that is way deep below the waters the Gulf of Mexico.
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