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Experimental work with lattices with thick struts show excellent strength properties as shown in for 50 % density Ti6Al4V lattices of two strut-based designs .
 concept or principle: Experimental; concept or principle: lattices; machine or equipment: struts; machanical property: strength properties; material: as; machanical property: density; concept or principle: lattices; engineering feature: strut-based designs
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: Experimental; concept or principle: lattices; machine or equipment: struts; machanical property: strength properties; material: as; machanical property: density; concept or principle: lattices; engineering feature: strut-based designs