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We started work on our letters the last week of February and worked on them the first week of March and sent them out a few weeks ago .
 our: entity
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: phone write 
  Option: entity, place 
Text: {0} 
Answer:
 our: entity