23821
At least that 's the idea behind a gathering Thursday and Friday in Tarrytown in Westchester County that offers the rare hope that maybe this rock can actually be rolled up the hill and stay there .
 location contains: Westchester County, Tarrytown
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:  Westchester County, Tarrytown 
Answer:
 location contains: Westchester County, Tarrytown