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As I said , the officers did tell me that this is the largest pro - troops demonstration that has ever been in San Francisco since the Vietnam War .
 San Francisco: place
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: demonstrate 
  Option: entity, place 
Text: {0} 
Answer:
 San Francisco: place