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This resulted in a relatively-smooth topology , due to the finer resolution representing the boundaries of the structure , whereas the size of the internal elements remained coarse .
 concept or principle: topology; process parameter: finer resolution; engineering feature: boundaries; concept or principle: structure; material: elements
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; process parameter: finer resolution; engineering feature: boundaries; concept or principle: structure; material: elements