22805
 Nearly 10 million gallons a day draining away in the driest state in the nation and the fastest growing one , propelled by the demographic rocket of Las Vegas is just one of the many strange byproducts of Nevada 's tangled love affair with gold . 
 location contains: Nevada, Las Vegas
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:  Nevada, Las Vegas 
Answer:
 location contains: Nevada, Las Vegas