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Griselda Blackwood Appearances in the books : A Bad Spell for the Worst Witch ( briefly ) Griselda Blackwood makes her first ( and only ) appearance in the third book of the series where she is kidnapped by Mildred Hubble so Mildred can take her place at the Halloween celebrations .
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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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