1291
The next paragraphs build on this idea of TO cellular structures by locally changing the cell density with the use of commercial software .
 process parameter: build; engineering feature: cellular structures; engineering feature: cell density; concept or principle: software
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:
 process parameter: build; engineering feature: cellular structures; engineering feature: cell density; concept or principle: software