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The advantages of this method , aside from the above mentioned , include obtaining controllable porosity , high strut density , wide neck formation , and small grain size ; all of which are beneficial to mechanical strength .
 porosity, strut, density, wide neck formation, grain size, mechanical strength
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:
 porosity, strut, density, wide neck formation, grain size, mechanical strength