1960
Post processing chemical cleaning to decrease strut roughness can be used to minimize this .
 concept or principle: Post processing chemical cleaning; machine or equipment: strut; machanical property: roughness; material: be
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: Post processing chemical cleaning; machine or equipment: strut; machanical property: roughness; material: be