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We hypothesise that the SS316L powder absorbs the laser energy at its surface while the trace elements in the 13-93 bioactive glass powder absorb and remit the infra-red radiation .
 material: powder; concept or principle: laser energy; concept or principle: surface; material: trace elements; material: bioactive glass; manufacturing process: radiation
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: powder, laser energy, surface, trace elements, bioactive glass, radiation 
Answer:
 material: powder; concept or principle: laser energy; concept or principle: surface; material: trace elements; material: bioactive glass; manufacturing process: radiation