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Discrepancies between the ideal and the actual performance of lattices , reviewed in , is owed to irregularities introduced during manufacturing , which include micro-voids or the change in surface roughness , making the prediction of the mechanical performance based on the relative density and linear elastic assumptions difficult .
 concept or principle: performance; concept or principle: lattices; manufacturing process: manufacturing; machanical property: micro-voids; machanical property: surface roughness; concept or principle: prediction; application: mechanical; machanical property: relative density; machanical property: elastic
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: performance; concept or principle: lattices; manufacturing process: manufacturing; machanical property: micro-voids; machanical property: surface roughness; concept or principle: prediction; application: mechanical; machanical property: relative density; machanical property: elastic