. >> my name is hannah morris, i am a recent graduate from the school of foreign service. i wanted to asking about the snapback and how this mechanism would work? especially because i can imagine six years down the line, some of these sanctions have been lifted, there is increased business, for example, and germany is benefiting. how does the snapback work if we have slight violations that not everyone agrees with is a violation? will the snapback mechanism be tied to certain behaviors that iran commits? i just want to understand what this mechanism would be like. ms. slavin: material reach and how do you want to define it? we have two ex-u.n. ambassadors here. ambassador araud: the snapback for the moment, the idea was that we did not want to in a sense to give -- to some members for bringing back sanctions. the french have invented a system which is the opposite. it means that the sanctions, the snapback is automatic, but if there is really a vote in the opposite direction, which changes the veto from one side to the other. but it has not yet been agreed. as for the mate