1031
In contrast , expertise-driven structural optimisation such as latticing is not a lightweighting strategy per se , as stiffness is greatly compromised in exchange for e.g .
 concept or principle: structural optimisation; material: as; machanical property: lightweighting; material: se; material: as
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 optimisation; material: as; machanical property: lightweighting; material: se; material: as