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Indian populations are concentrated in a few areas , with the largest concentration of indigenous-language-speaking individuals is living in 5 of Chiapas 's 9 economic regions : Los Altos , Selva , Norte , Fronteriza , and Sierra .
 Chiapas, Los Altos, Selva, Norte, Fronteriza, Sierra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chiapas, Los Altos, Selva, Norte, Fronteriza, Sierra