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By Fredrik Dahl VIENNA (Reuters) - Iran and six world powers began expert-level talks on Monday to work out nitty gritty details in implementing a landmark accord for Tehran to curb its disputed nuclear program in return for a limited easing of sanctions. The preliminary accord is seen as a first step towards resolving a decade-old standoff over suspicions Iran might be covertly pursuing a nuclear weapons "breakout" capability, a perception that has raised the risk of a wider Middle East war. Officials from Iran and the United States, France, Germany, Britain, China and Russia met at the Vienna headquarters of the U.N. nuclear agency, which will play a central role in verifying that Tehran carries out its part of the interim deal. The outcome of the meeting is expected to determine when Iran stops its most sensitive nuclear activity and when it gets the respite in sanctions that it has been promised in return.