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The indigenous Bubi population of Bioko , pushed into the interior of the island and decimated by alcoholic addiction , venereal disease , smallpox and sleeping sickness , refused to work on plantations .
 Bubi, Bioko
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bubi, Bioko