6265
In addition , adopting a qualitative approach with the spectral data and applying PCA , it was possible to discriminate between the four samples types and also , by generation of Cooman ' s plots , possible to distinguish between adulterated and non - adulterated samples .
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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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