161886
Russian Empire The modern postal service in Azerbaijan began in the early 19th century , when Azerbaijan became a part of the Russian Empire .
 location: Empire; location: Azerbaijan; location: Azerbaijan; location: Russian 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: Empire, Azerbaijan, Azerbaijan, Russian Empire 
Answer:
 location: Empire; location: Azerbaijan; location: Azerbaijan; location: Russian Empire