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In this paper , the potential of selective laser melting ( SLM ) of stainless steel CL 20ES powder was investigated with a focus on controlled fabrication of porous structures with strongly reduced pore sizes , i.e .
 manufacturing process: selective laser melting; manufacturing process: SLM; material: stainless steel; process characterization: CL; material: powder; manufacturing process: fabrication; machanical property: porous; process parameter: pore sizes
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: selective laser melting, SLM, stainless steel, CL, powder, fabrication, porous, pore sizes 
Answer:
 manufacturing process: selective laser melting; manufacturing process: SLM; material: stainless steel; process characterization: CL; material: powder; manufacturing process: fabrication; machanical property: porous; process parameter: pore sizes