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Leaving Angel , Kirisin and Simralin use a hot-air balloon to travel to the elven city of Arborlon where they discover a demon army hiding outside the city , waiting for the order to attack .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None