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4 Strut-sizing and -scaling for structurally optimized trusB-like structures Emerged from the idea to drastically decrease the computational complexity and processing time , the size matching and scaling method for mesoscale lattices , represents an alternative approach for structural optimisation .
 concept or principle: complexity; engineering feature: mesoscale lattices; concept or principle: structural optimisation
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: complexity; engineering feature: mesoscale lattices; concept or principle: structural optimisation