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astelin GJELTEN: Hufbauer says these sanctions were effective, at least in this limited sense, because in contrast to past sanction's regimes, they were tremendously costly to the Iranian economy and with little way around them. This weekend's accord relieves some sanctions, most are left in place pending a final agreement six months to a year from now. At that point, there could be further relief, or if there's no agreement on the outstanding issues, the sanctions could be reimposed.