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Steve Ballmer attempted to explain the digital nervous system by saying the following : Gates himself offered the following explanation as part of a keynote speech at Microsoft 's Second Annual CEO Summit in 1998 .
 Steve Ballmer, Gates, Microsoft
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Steve Ballmer, Gates, Microsoft