1205
To guarantee the same weight of structures with various unit cell densities , the external topology was adapted accordingly , revealing an improved performance for less dense lattices .
 process parameter: weight; concept or principle: unit cell; concept or principle: topology; concept or principle: performance; concept or principle: lattices
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:
 process parameter: weight; concept or principle: unit cell; concept or principle: topology; concept or principle: performance; concept or principle: lattices