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Design of such cavities with unmelted powder could improve production rates by eliminating the need for some fraction of hatch melting in the interior of additively-manufactured structures .
 Design, powder, production, fraction, melting
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:
 Design, powder, production, fraction, melting