But the practice is based not on the brainchild of any university professor or crime expert, but in fiction - the character of Sherlock Holmes, created by Sir Arthur Conan Doyle.
Economic analysis is itself value-free, but in practice it encourages a cosmopolitan interest in natural equality.
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But the practice doesn't make sense "if there's no rhyme or reason to it, " he added.
They may articulate what is right, but in practice it is a different story.
Murder may not be state policy, but the practice is widespread, well-known and condoned.
But in practice, Google has let plenty of malicious apps into its Android Market before.
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The party's rules already grant its 70m-odd members these rights, but in practice they are ignored.
But in practice such bills have little chance of success, unless they get government support.
But in practice Mr Gonzales has shown few signs of even trying to draw it.
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They can be rejected by Congress, but in practice it tends to rubber-stamp them.
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But the practice sounds uncomfortably similar to what's banned on Wall Street for public stocks.
But in practice they don't, because subtle mechanical effects distort the regularity of the oscillations.
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But this practice is unlikely to endure now that BHP has abandoned the deal.
But in practice the heads of operational units will favour the known over the unknown.
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But in practice, when you have no other distractions, you actually become more productive.
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But in practice, nothing can protect the forest once a logging road is opened up.
But in practice they have continued the previous strategy of attempting to muddle through.
But in practice the administration does not think the group up to the task.
But in practice as the General Accounting Office, the congressional watchdog, recently admitted there is little oversight.
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But in practice, the knowledge problem and public-choice problems make such an ideal bank an illusion.
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The central government in Beijing may appear all-powerful to outsiders, but in practice its reach is limited.
But in practice, they are missing the mark and, for many borrowers, may be making things worse.
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This scheme has been denounced by the right-wing press, but in practice, will make very little difference.
But in practice, this responsibility for the future is often overwhelmed by the politics of the moment.
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In theory, foreign companies will be free to bid for Yuganskneftegaz, but in practice this is unlikely.
Academies are allowed flexibility over pay - but in practice many rely upon the national pay scales.
The government added constitutional language to provide for alternative service, but in practice does not permit alternative service.
Glossy paint is perfect for product photos and store shelves, but in practice is a dust-attracting fingerprint magnet.
But the practice of Islam comes in great variety as there is much diversity in ethnicity among Muslims.
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