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In addition to the complete concert , the DVD features Part 2 of " The History of Iron Maiden " DVD series , which began with 2004 's The Early Days , documenting the recording of the Powerslave album and the following tour .
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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:
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