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Even though the structure was printed using laser power bed fusion of stainless steel , no experimental verification was conducted , which is a recurring shortcoming in many of the reviewed studies on structural optimisation using either TO or lattices .
 concept or principle: structure; manufacturing process: laser power bed fusion; material: stainless steel; concept or principle: experimental; concept or principle: structural optimisation; concept or principle: lattices
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: structure; manufacturing process: laser power bed fusion; material: stainless steel; concept or principle: experimental; concept or principle: structural optimisation; concept or principle: lattices