638
 The letter delivered Thursday means Iran has rejected the demands of the five permanent members of the Security Council the United States , Russia , China , France , Britain as well as Germany and Dr. ElBaradei himself , that Iran once again close its uranium enrichment plant at Natanz . 
 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