42870
Mr. Soltaniyeh , whose experience in nuclear matters predates the Islamic Revolution of 1979 in Iran , also confirmed that his country would resume its program to build 50,000 centrifuges eventually at Natanz and begin full-scale production of '' tons '' of enriched uranium there .
 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