20283
 The Institute for Science and International Security , which monitors Iran , said Thursday that '' Iran still needs to repair and operate its first 164-machine test cascade at the Natanz pilot plant , '' and that it has to overcome considerable hurdles . '' 
 Iran, Natanz
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 Iran, Natanz