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A connection between relative cell density , unit cell structure and structural performance , was established , giving designers and engineers helpful indications for the selection of the adequate lattice configuration .
 engineering feature: cell density; concept or principle: unit cell; concept or principle: structure; process characterization: structural performance; concept or principle: lattice configuration
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: cell density; concept or principle: unit cell; concept or principle: structure; process characterization: structural performance; concept or principle: lattice configuration