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To enable further increases in performance , it is critical to characterize and control the surface quality of fully interior channels which have higher surface roughness compared to exterior top surfaces .
 performance, surface quality, surface roughness, surfaces
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 performance, surface quality, surface roughness, surfaces