13731
But in messages and letters to the agency in recent days , Iran said it planned to reopen the enrichment complex , in Natanz in central Iran , and perhaps an unspecified number of other sites , said the officials , who declined to be identified by name because they lack authorization to discuss the matter for attribution .
 location contains: Iran, Natanz; 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; Iran, Natanz 
Answer:
 location contains: Iran, Natanz; location contains: Iran, Natanz