4949
Today , standard metal powders like stainless steel , titanium , aluminium or copper are widely used with SLM technology .
 concept or principle: standard; material: metal powders; material: stainless steel; material: titanium; material: aluminium; material: copper; manufacturing process: SLM
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: standard, metal powders, stainless steel, titanium, aluminium, copper, SLM 
Answer:
 concept or principle: standard; material: metal powders; material: stainless steel; material: titanium; material: aluminium; material: copper; manufacturing process: SLM