5086
In 1989 , he helped pull two small children out of the wreckage of United Airlines Flight 232 , which was en route from Denver to Chicago when it crashed trying to make an emergency landing at the airport in Sioux City , Iowa .
 location contains: Iowa, Sioux City
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 location contains: Iowa, Sioux City