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Sao: “they are committing indefinitely to never procure or develop nuclear weapons. that is a significant concession, something the president cared a great deal about, and then of course there's a separate issue about how do you enforce that, how do you ensure that that that doesn't happen, you know, we're not happy with a well, I just say we're happy with the commitment to not build a nuclear weapon, but we have to verify that, and that's why the deal is structured in the way that it is, is to ensure that there's a verification and inspections regime, and that they don't receive the benefits of the negotiation until we see that they're actually taking the affirmative steps in order to dismantle that nuclear program.