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In the Trojan War the besieging Greeks discovered that they would be unable to take the city while it was protected by it , and so Odysseus and Diomedes stole from the citadel of Troy before taking the city by the ruse of the Trojan Horse .
 location: Troy
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: Troy 
Answer:
 location: Troy