1186
2 Graded lattices derived from mapping combined with density-based TO Various studies have utilized a mapping approach to update a cellular structure based on the density values obtained from unpenalized TO .
 concept or principle: lattices; engineering feature: cellular structure; machanical property: density
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: lattices; engineering feature: cellular structure; machanical property: density