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Selective Laser Sintering ( SLS ) of ceramic powders is studied in order to understand how the initial material properties and the process conditions affect the degree of sintering/melting and the mechanical properties of the sintered material .
 Selective Laser Sintering, SLS, ceramic powders, material properties, process, mechanical properties, sintered, material
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 Sintering, SLS, ceramic powders, material properties, process, mechanical properties, sintered, material