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Suppliers of red-light cameras in the US include :  Affiliated Computer Services  ( ACS ) State and Local Solutions a Xerox company of  Dallas  Texas ; American Traffic Solutions of Scottsdale Arizona 1/3 owned by Goldman Sachs ; Brekford International Corp. of Hanover Maryland ; CMA Consulting Services Inc. of Latham New York ; Gatso USA of Beverly Massachusetts ; iTraffic Safety LLC of Ridgeland South Carolina ; Optotraffic of Lanham Maryland ; Redflex Traffic Systems of Phoenix Arizona with its parent company in Australia ; RedSpeed-Illinois LLC of Lombard Illinois whose parent company is in Worcestershire England ; SafeSpeed LLC of Chicago Illinois and SENSYS America Inc. of Miami Florida .
 city of headquarters: Affiliated Computer Services, Dallas
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 city of headquarters: Affiliated Computer Services, Dallas