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Authors highlighted the superiority of the proposed lattice types in terms of specific stiffness over the uniform lattice and the robustness of the graded lattice making it the most well-rounded performing lattice .
 concept or principle: lattice; machanical property: specific stiffness; concept or principle: lattice; machanical property: robustness; concept or principle: lattice; concept or principle: lattice
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: lattice; machanical property: specific stiffness; concept or principle: lattice; machanical property: robustness; concept or principle: lattice; concept or principle: lattice