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The spokesman added that he " would obviously call on all sides to do what they can to break the cycle of violence , because it is only through engagement that we can realise the vision everyone wants to see .
 sides: attacker
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 sides: attacker