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In this paper , we propose a data-driven method to understand in situ behavior of recycled powder on the build platform .
 in situ, recycled, powder, build platform
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:
 in situ, recycled, powder, build platform