The agency 's report confirmed that Iran had completed a system of 164 centrifuges to enrich uranium at its plant at Natanz in March , adding that another two systems , or cascades , of the same size were under construction there .
Iran /location/location/contains Natanz
DT NN POS NN VBD IN NNP VBD VBN DT NN IN CD NNS TO VB NN IN PRP$ NN IN NNP IN NNP , VBG IN DT CD NNS , CC NNS , IN DT JJ NN VBD IN NN RB .