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The research work started with the AM building of a stainless steel 316 L industrial impeller that was then machined by removing around 0.5 mm from certain surfaces of the impeller ’ s blades and hub .
 concept or principle: research; manufacturing process: AM; material: stainless steel; application: industrial; manufacturing process: machined; manufacturing process: mm; concept or principle: surfaces; material: s
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: research, AM, stainless steel, industrial, machined, mm, surfaces, s 
Answer:
 concept or principle: research; manufacturing process: AM; material: stainless steel; application: industrial; manufacturing process: machined; manufacturing process: mm; concept or principle: surfaces; material: s