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We have a number of means to verify Iran's activities in a number of areas related to the JCPOA. When Iran starts curtailing these accesses, at some point, if the JCPOA was to be revived... the participants need to have a baseline, a necessary amount to know what it is that Iran has or( doesn't have), in order for us to verify, if you don't have that, it's technically impossible to have an agreement.