1242
Besides the modification of the topology as certain struts that have a minor contribution to the structural performance are eliminated , the method mainly centres on the size optimisation of the struts .
 concept or principle: topology; material: as; machine or equipment: struts; process characterization: structural performance; machine or equipment: struts
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: topology; material: as; machine or equipment: struts; process characterization: structural performance; machine or equipment: struts