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The use of light as a stimulus for healing offers several attractive features , including the ability to deliver the stimulus locally , which opens up the possibility of healing the material under load , as well as the ability to tailor the wavelength of light to selectively address a specific component of the material , e . g . only the damaged parts .
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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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