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This memorandum , when it came to light after the war , played a key role in refuting Frank 's claims that he had no knowledge that Jews were being murdered en masse in the extermination camps of Operation Reinhard .
 Frank
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frank