32904
A final -- although less serious -- issue is that Iran conducted maintenance work on some valves involved in the enrichment program that were either broken or contaminated at the Natanz site .
 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