Free from Rome's oversight, competition in banking opened up simply by removing the proscription on lending.

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Mr Brunstrom said there is no particularly sound logic to the pattern of proscription created by Britain's 1971 drugs legislation.

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Compare a contractum trinius to a murabaha contract, a structured financial product offered by Islamic banks as a way around the Koran's proscription of riba, or usury.

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But Mohan Peiris, the attorney-general, said in an interview that new regulations are to be promulgated under the Prevention of Terrorism Act (PTA) to provide for the continued proscription of the Tigers and a fresh regime for holding detainees.

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