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They found that unlike her two previous studio efforts , " Hard Candy " ( 2008 ) and " MDNA " ( 2012 ) , the album 's sound was progressive .
 Hard Candy, MDNA
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:
 Hard Candy, MDNA