3826
And there are few horsier spots in Texas than the Richmond State School in this town 30 miles southwest of Houston , where a therapeutic riding program using horses retired by the Texas prison system has helped hundreds of severely retarded residents in state care learn basic skills like walking and communicating .
 location contains: Texas, Houston; location contains: Texas, Houston
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:  Texas, Houston; Texas, Houston 
Answer:
 location contains: Texas, Houston; location contains: Texas, Houston