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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 .
 engineering feature: Design; material: powder; manufacturing process: production; concept or principle: fraction; manufacturing process: melting
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: Design, powder, production, fraction, melting 
Answer:
 engineering feature: Design; material: powder; manufacturing process: production; concept or principle: fraction; manufacturing process: melting