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The Blizzard WorldWide Invitational ( abbreviated as WWI ) is an event organized by Blizzard Entertainment to meet players , offer playable demos of future games , and offer various activities linked with Warcraft , Starcraft , and Diablo universes .
 Blizzard, Blizzard Entertainment
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Blizzard, Blizzard Entertainment