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Selective laser melting ( SLM ) is a commonly used powder bed fusion metal additive manufacturing ( AM ) process .
 Selective laser melting, SLM, powder bed fusion, metal additive manufacturing, AM, process
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:
 Selective laser melting, SLM, powder bed fusion, metal additive manufacturing, AM, process