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Speculation has been rife that troubled Vivendi has been weighing a spinoff or sale of its US film , television and theme park operations as part of its restructuring .
 operations: artifact; Vivendi: seller
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:
 operations: artifact; Vivendi: seller