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Given the political and military situation , Roger found an opportunity to make his services useful in the east in fighting against the Ottoman Turks , who were ravaging the Byzantine Empire .
 person: Roger; location: Ottoman Turks; location: Byzantine Empire
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: Roger, Ottoman Turks, Byzantine Empire 
Answer:
 person: Roger; location: Ottoman Turks; location: Byzantine Empire