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The pro - reform director of Iran ' s biggest - selling daily newspaper and official organ of Tehran ' s municipality has stepped down following the appointment of a conservative as the city ' s new mayor , press reports said Sunday .
 director: person; Tehran: place; newspaper: 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: end position 
  Option: person, entity, place 
Text: {0} 
Answer:
 director: person; Tehran: place; newspaper: entity