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The Times said Vivendi Universal was negotiating to sell its flagship theme parks to New York investment firm Blackstone Group as a the first step toward dismantling its entertainment empire .
 parks: artifact; Vivendi Universal: seller; Blackstone Group: buyer
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: transfer ownership 
  Option: artifact, seller, place, beneficiary, buyer 
Text: {0} 
Answer:
 parks: artifact; Vivendi Universal: seller; Blackstone Group: buyer