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Thousands of Iraq ' s majority Shiite Muslims marched to their main mosque in Baghdad to mark the birthday of Islam ' s founder Prophet Mohammed .
 Baghdad: place; Muslims: 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: demonstrate 
  Option: entity, place 
Text: {0} 
Answer:
 Baghdad: place; Muslims: entity