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In the simplest case when the map is unimodal , with a maximum at c , each coefficient Dk is either +1 or − 1 , according to whether the ( k + 1 ) st iterate f k +1 has local maximum or local minimum at c. See also References
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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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