6407
The announcement comes two days after  India  's biggest mobile service provider  Bharti Airtel  Ltd. said it was pulling out of talks with MTN .
 country of headquarters: India, Bharti Airtel
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: India, Bharti Airtel