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In this study , a meta-model was created , which was comprised of the geometrical manufacturing constraints regarding the deflection of horizontal struts and the thickness of struts with reference to the inclination angle .
 concept or principle: geometrical manufacturing constraints; engineering feature: horizontal struts; machine or equipment: struts; engineering feature: inclination angle
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: geometrical manufacturing constraints; engineering feature: horizontal struts; machine or equipment: struts; engineering feature: inclination angle