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Lawrence Summers tapped as the director of the National Economic Council in the incoming Obama administration has long regretted that his tenure as  Treasury  secretary was cut short by Al Gore's defeat in 2000 less than 1 and 1/2 years after he succeeded  Robert Rubin  .
 employee of: Treasury, Robert Rubin
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:  Treasury, Robert Rubin 
Answer:
 employee of: Treasury, Robert Rubin