it has been reported that the a.q. khan designs and plans have been copied. do you know if that black market network are currently supporting iran's program? and what tools do we have to deal with black market nuclear materials? the whole discussion here has been about our allies and working with our allies. ut we have some other very dangerous situations to deal with here. nd secretary sherman, if you want to start, please go ahead. want to be mindful of the setting in how i respond. let me just say this. we are focused very carefully on who is supplying material to iran and in particular to iran's nuclear program. we have obviously a range of sanctions in place against entities in iran as well as entities outside iran that have been supportive of their nuclear proliferation activities and we continue to track very closely the individuals and entities involved in supplying iran's nuclear program, the material for its program. i don't want to get into any greater specificity on that in this setting. we are happy to brief you in a different setting with additi