20835
 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: 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:
 location contains: Iowa, Sioux City