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However , statisticians estimate that in 1835 , roughly 50 % of the population was " preto " ( black ; most were enslaved ) , a further 20 % was " pardo " ( brown ) , and 25 % white , with the remainder Amerindian .
 None
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:  
Answer:
 None