8767
The proposal as described appears to refer to Iran 's work at Natanz , where it is building a prototype plant that would hold 1,000 centrifuges and an industrial-scale one that would hold 50,000 machines .
 Iran, Natanz
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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} 
Answer:
 Iran, Natanz