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Fatigue of laser beam powder bed fused ( LB-PBF ) 316 L stainless steel is investigated .
 machanical property: Fatigue; concept or principle: laser beam; machine or equipment: bed; material: stainless steel
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: Fatigue, laser beam, bed, stainless steel 
Answer:
 machanical property: Fatigue; concept or principle: laser beam; machine or equipment: bed; material: stainless steel