704
Since coalition troops seized Baghdad ' s international airport , they have encircled the heavily - bombed city of 5 million people , blocking off entry and exits and monitored all movement from the air .
 airport: artifact; city: place; troops: 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:
 airport: artifact; city: place; troops: buyer