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The flow equation for the effective action In quantum field theory , the effective action \ Gamma is an analogue of the classical action functional S and depends on the fields of a given theory .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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