7157
Indonesia  ordered 12 F-16A / B Fighting Falcon Block 15 OCU as a new fighter to strengthen the  Indonesian Air Force  in 1989 .
 country of headquarters: Indonesia, Indonesian Air Force
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:
 country of headquarters: Indonesia, Indonesian Air Force