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The short feature , which was preceded by a commercial for the final two episodes of '' The West Wing , '' looked at the difficulties faced by Barbaro 's trainer , Michael Matz , who survived a plane crash in Sioux City , Iowa , then led three children to safety ; Alex Solis , who broke his back in a track spill two years ago but rode Brother Derek on Saturday ; and Brother Derek 's trainer , Dan Hendricks , who was paralyzed in a motocross accident .
 location contains: Iowa, Sioux 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:  Iowa, Sioux City 
Answer:
 location contains: Iowa, Sioux City