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Production for the album took place at various recording studios during 2009 to 2010 and was mostly produced by longtime collaborators 40 and Boi-1 da .
 40, Boi-1 da
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:
 40, Boi-1 da