3057
Indeed , Merrill is the biggest employer and taxpayer in Plainsboro , a fast-developing town in Middlesex County that clings to Princeton , in Mercer County , from across busy Route 1 .
 location contains: Mercer County, Princeton
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:  Mercer County, Princeton 
Answer:
 location contains: Mercer County, Princeton