3732
Dubai World  initially said its profitable ports and related free zone operations would be exempt from the restructuring along with its private equity division  Istithmar  World and Infinity World Holding the co-owner of Las Vegas ' new $ 8.5 billion CityCenter hotel and casino complex .
 subsidiaries: Dubai World, Istithmar
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:  Dubai World, Istithmar 
Answer:
 subsidiaries: Dubai World, Istithmar