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Ti6Al4V + Al12Si compositionally graded cylindrical structures were fabricated on a Ti6Al4V substrate using laser engineered net shaping ( LENS™ ) process .
 Ti6Al4V, cylindrical, fabricated, Ti6Al4V substrate, laser engineered net shaping, 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:
 Ti6Al4V, cylindrical, fabricated, Ti6Al4V substrate, laser engineered net shaping, process