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American units advancing west of Basra have already secured the Rumeila oil field , whose daily output of 1 . 3 million barrels makes it Iraq ' s most productive .
 Basra: place; units: 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:
 Basra: place; units: buyer