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Representatives attending the 1921 Conference on Unemployment held in  Washington  D.C. President Warren Harding convened a President's Conference on Unemployment at the instigation of then Commerce Secretary  Herbert Hoover  as a result of rising unemployment during the recession .
 employee of: Washington, Herbert Hoover
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:
 employee of: Washington, Herbert Hoover