20209
Only a month after Iran defied Europe and the International Atomic Energy Agency and declared it would restart what it termed research on enrichment , it has put 10 centrifuges into operation at the vast uranium enrichment plant at Natanz , according to the officials .
 location contains: Iran, Natanz
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Iran, Natanz 
Answer:
 location contains: Iran, Natanz