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Mark Liberman calculated the storage requirements for all human speech at 42 zettabytes ( 42,000 exabytes , and 8,400 times the original estimate ) if digitized as 16 " kHz 16-bit audio , although he did freely confess that " maybe the authors [ of the exabyte estimate ] were thinking about text " .
 Mark Liberman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mark Liberman