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But Bosnian Serb leaders have hinted they would boycott the poll if the municipal elections were postponed , or go ahead with their own .
 else: Bosnian Serb
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, else, organization, person 
Text: {0} 
 Entities: Bosnian Serb 
Answer:
 else: Bosnian Serb