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Cullather 's study , according to Lars Schoultz , is " an exceptionally valuable document-not simply a lucid chronicle of who did what to whom , but a vivid cautionary tale about how the cloak of secrecy allowed government officials to avoid questions of perspective , of proportion , and of right and wrong " .
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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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