1010
With the addition of the new and so far only connection between  Berlin  and Chicago from 23 March 2013  Air Berlin  uses the Chicago hub for connections within the United States .
 city of headquarters: Berlin, Air Berlin
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: Berlin, Air Berlin