21394
At one precinct in Sadr City , the giant slum area where as many as half of Baghdad 's five million people live , 1,750 of the 2,400 registered voters cast ballots by late afternoon , a turnout of 73 percent .
 location contains: Baghdad, Sadr City
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:  Baghdad, Sadr City 
Answer:
 location contains: Baghdad, Sadr City