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The network is the oldest unit of the  CBS  Corporation and traces its roots to CBS's predecessor United Independent Broadcasters founded in  1927  with 47 affiliates .
 founded: CBS, 1927
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:  CBS, 1927 
Answer:
 founded: CBS, 1927