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this is one technique , one possible way u . s . forces might seize a bridge , a bridge that might be defended by iraqis .
 bridge: artifact; iraqis: seller; forces: 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:
 bridge: artifact; iraqis: seller; forces: buyer