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Lack-of-fusion flaws can occur in powder bed fusion ( PBF ) additive manufacturing of metal components .
 concept or principle: flaws; manufacturing process: powder bed fusion; manufacturing process: PBF; manufacturing process: additive manufacturing; material: metal; machine or equipment: components
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: flaws, powder bed fusion, PBF, additive manufacturing, metal, components 
Answer:
 concept or principle: flaws; manufacturing process: powder bed fusion; manufacturing process: PBF; manufacturing process: additive manufacturing; material: metal; machine or equipment: components