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The significance of powder feedstock characteristics in defect suppression is clarified with the aid of numerical simulations .
 machine or equipment: powder feedstock; concept or principle: defect; enabling technology: numerical simulations
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: powder feedstock, defect, numerical simulations 
Answer:
 machine or equipment: powder feedstock; concept or principle: defect; enabling technology: numerical simulations