9311
As of 2013 the  St. Louis  area is home to nine Fortune 500 companies :  Express Scripts  Emerson Electric Monsanto Reinsurance Group of America Centene Peabody Energy Ameren Graybar Electric and Edward Jones .
 city of headquarters: St. Louis, Express Scripts
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  St. Louis, Express Scripts 
Answer:
 city of headquarters: St. Louis, Express Scripts