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The three main types of fibres are natural vegetable fibre s ( such as cotton , linen , jute and hemp ) , man-made fibers ( made by industrial processes ) and protein based fibers ( such as wool , silk ) .
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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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