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In Laser powder bed fusion ( L-PBF ) , metal powders , sensitive to humidity and oxygen , like AlSi10Mg or Ti-6Al-4 V are used as starting material .
 manufacturing process: Laser powder bed fusion; manufacturing process: L-PBF; material: metal powders; material: oxygen; material: AlSi10Mg; material: Ti-6Al-4 V; material: as; material: material
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: Laser powder bed fusion, L-PBF, metal powders, oxygen, AlSi10Mg, Ti-6Al-4 V, as, material 
Answer:
 manufacturing process: Laser powder bed fusion; manufacturing process: L-PBF; material: metal powders; material: oxygen; material: AlSi10Mg; material: Ti-6Al-4 V; material: as; material: material