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Also to note , Holocaust 's name was mentioned by Apocalypse in issue # 4 , a year before the character made its first actual appearance ( first referred in Stryfe 's Strike Files ) in the Age of Apocalypse story arc .
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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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