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For example , one 640 MB compact disc ( CD ) holds approximately one hour of uncompressed high fidelity music , less than 2 hours of music compressed losslessly , or 7 hours of music compressed in the MP3 format at a medium bit rate .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None