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When bulky structures are generated using standard layer-by-layer tool paths , the build rate in the outer contour of the part may lag behind the build rate in the interior .
 concept or principle: standard; concept or principle: layer-by-layer; process characterization: build rate; engineering feature: contour; process characterization: build rate
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: standard; concept or principle: layer-by-layer; process characterization: build rate; engineering feature: contour; process characterization: build rate