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This paper addresses a comprehensive analytical model for the laser powder-fed additive manufacturing ( LPF-AM ) process , also known as directed energy deposition AM .
 model, laser, additive manufacturing, process, as, deposition, AM
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 model, laser, additive manufacturing, process, as, deposition, AM