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It is however of note , that isotropic open-cell trusB-like structures have an up to threefold inferior stiffness performance compared to their closed-cell lattice counterparts of the same relative density .
 machanical property: isotropic; machanical property: stiffness; concept or principle: performance; concept or principle: lattice; machanical property: relative 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:
 machanical property: isotropic; machanical property: stiffness; concept or principle: performance; concept or principle: lattice; machanical property: relative density