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 options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Indonesia, Indonesian Air Force 
Answer:
 country of headquarters: Indonesia, Indonesian Air Force