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Petraeus is also an author of the Army's new doctrine on how to fight a counterinsurgency developed during his stint last year as head of the Combined Arms Center and the  Command and General Staff College  at  Fort Leavenworth  Kansas .
 city of headquarters: Command and General Staff College, Fort Leavenworth
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: Command and General Staff College, Fort Leavenworth