24374
Cellulose nanocrystals and cellulose nanofibers with I and II crystalline allomorphs ( designated as CNC I , CNC II , CNF I , and CNF II ) were isolated from bleached wood fibers by alkaline pretreatment and acid hydrolysis .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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