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Inherent viscosity is defined as \ eta _ = \ frac where c is the mass concentration of the polymer ( g/dL ) and \ eta _ is the relative viscosity , which is defined as \ eta _ = \ frac where \ eta is the viscosity of the solution and \ eta_0 is the viscosity of the neat solvent .
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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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