8687
Moody's which estimates  Dubai  's overall debt at 100 billion dollars only has ratings on DP World and Jebel Ali Free Zone among  Dubai World  's operations .
 city of headquarters: Dubai, Dubai World
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: Dubai, Dubai World