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Byrne  David Orr  and Richard M. Daley are currently the only living former Mayors of  Chicago  .
 employee of: David Orr, Chicago
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:  David Orr, Chicago 
Answer:
 employee of: David Orr, Chicago