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The population of the archipelago is mostly concentrated in the two capital islands : around 43 % on the island of Tenerife and 40 % on the island of Gran Canaria .
 Tenerife, Gran Canaria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tenerife, Gran Canaria