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After the September 11 terrorist attacks in 2001 the Ethiopian army began to train with the U.S.  Combined Joint Task Force - Horn of Africa  ( CJTF-HOA ) established in  Djibouti  .
 city of headquarters: Combined Joint Task Force - Horn of Africa, Djibouti
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:
 city of headquarters: Combined Joint Task Force - Horn of Africa, Djibouti