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Pre-electoral bickering flared on Wednesday in the troubled western Mexican state of Guerrero as some opposition politicians demanded the army pull out of the area ahead of an upcoming state poll .
 Mexican, Guerrero
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Mexican, Guerrero