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Iran's Atomic Energy Organization ( IAEO ) expressed in a letter sent to secretary general of the  International Atomic Energy Agency  ( IAEA )  Hans Blix  today its deep concern for the clear violation of the Comprehensive Test Ban Treaty ( CTBT ) by the United States .
 employee of: International Atomic Energy Agency, Hans Blix
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: International Atomic Energy Agency, Hans Blix