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Mapping strut-based unit cells with different densities into a hexahedral mesh of a topologically optimized structure enabled Robbins to create structures with an external topology based on the penalized SIMP-result filled with a conformal lattice with properties determined from the homogenization method .
 engineering feature: strut-based; application: cells; concept or principle: topologically; concept or principle: structure; concept or principle: topology; engineering feature: conformal lattice; concept or principle: properties; manufacturing process: homogenization method
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:
 engineering feature: strut-based; application: cells; concept or principle: topologically; concept or principle: structure; concept or principle: topology; engineering feature: conformal lattice; concept or principle: properties; manufacturing process: homogenization method