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Three five-pointed stars , one at each of the triangle 's points , stand for the three major island groups : Luzon , Visayas and Mindanao .
 Luzon, Visayas, Mindanao
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Luzon, Visayas, Mindanao