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Three five-pointed stars , one for each of the triangle 's points , stand for the three major geographical island groups that comprise the Philippines : Luzon , Visayas and Mindanao .
 Mindanao
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mindanao