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In the two main classes the hydroxyl group can be placed in the alpha position ( an alpha-hydroxy ketone RCR ' ( OH ) ( CO ) R ) or in the beta position ( a beta-hydroxy ketone , RCR ' ( OH ) CR2 ( CO ) R ) .
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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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