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The symmetrical quasi - classical ( SQC ) approach involves defining a classical action window function centered at integer quantum values of the action , choosing a width parameter that is less than unit quantum width , and applying the window function to both initial reactant and final product vibrational states .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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