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He was critical of the two-part story arc , stating that they had " neither the liveliness and dynamism " of " The Secret of the Unicorn " and " Red Rackham 's Treasure " , " nor the supernatural quality " of " The Seven Crystal Balls " - " Prisoners of the Sun " .
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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:
 None