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To avoid slender struts without infill , a length scale constraint is introduced in , which was implemented by an erosion and dilation projection before a final sensitivity analysis was conducted .
 engineering feature: slender struts; process parameter: infill; process characterization: length scale; concept or principle: sensitivity analysis
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:
 engineering feature: slender struts; process parameter: infill; process characterization: length scale; concept or principle: sensitivity analysis