2876
All of  Pakistan  's airlines use Karachi as their primary transport hub including PIA Pakistan International Airlineshttp : / / www.piac.aero Airblue and  Shaheen Air International  .
 country of headquarters: Pakistan, Shaheen Air International
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: Pakistan, Shaheen Air International