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For AM processes—specifically Laser Powder Bed Fusion ( L-PBF ) processes—powder flowability is essential for the product quality , as these processes are based on a thin layer spreading mechanism .
 manufacturing process: AM; manufacturing process: Laser Powder Bed Fusion; manufacturing process: L-PBF; concept or principle: product quality; material: as; concept or principle: processes; process parameter: layer; concept or principle: mechanism
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: AM, Laser Powder Bed Fusion, L-PBF, product quality, as, processes, layer, mechanism 
Answer:
 manufacturing process: AM; manufacturing process: Laser Powder Bed Fusion; manufacturing process: L-PBF; concept or principle: product quality; material: as; concept or principle: processes; process parameter: layer; concept or principle: mechanism