4941
 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
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Texas, Houston 
Answer:
 location contains: Texas, Houston