23081
 The challenge proved addictive , and he has been with Christo and his spouse , Jeanne-Claude , ever since , first as a consultant for '' Wrapped Reichstag '' in Berlin 10 miles of blue rope was used to wrap the building in silver fabric , next as the design engineer in 1996 for the as-yet-unrealized '' Over the River '' installation on 40 miles of the Arkansas River in Colorado . 
 location contains: Colorado, Arkansas River
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:  Colorado, Arkansas River 
Answer:
 location contains: Colorado, Arkansas River