13608
In the 15th century , the Inca Empire had a unique way to record census information .
 location: Inca 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: Inca Empire 
Answer:
 location: Inca Empire