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The stability and regularity of the solidified track are a direct output of the simulations , and their variations with material and process conditions are discussed .
 stability, simulations, variations, material, 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:
 stability, simulations, variations, material, process