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The quality of produced parts is highly dependent on the proper selection of processing parameters , requiring significant testing and experimentation to determine parameters for a given machine and material .
 quality, parameters, testing, parameters, machine, 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:
 quality, parameters, testing, parameters, machine, material