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The men were all volunteers as conscription did not apply to the Caucasus and , although it was difficult to maintain discipline , they were an effective fighting force .
 location: Caucasus
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: Caucasus 
Answer:
 location: Caucasus