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By using the SIMP based structural optimization , Guest and Prevost developed a topology optimization technique to find a scaffold with pores in the shape of a Schwartz primitive structure , resulting in the maximum permeability .
 concept or principle: structural optimization; engineering feature: topology optimization; engineering feature: scaffold; machanical property: pores; biomedical: Schwartz primitive structure; machanical property: permeability
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: structural optimization; engineering feature: topology optimization; engineering feature: scaffold; machanical property: pores; biomedical: Schwartz primitive structure; machanical property: permeability