2038
For the hollowing process , sub-volumes are generated via a set of specific algorithms within the original 3D CAD model and used to do Boolean operations .
 concept or principle: process; application: set; concept or principle: algorithms; concept or principle: 3D; concept or principle: model; enabling technology: Boolean operations
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: process; application: set; concept or principle: algorithms; concept or principle: 3D; concept or principle: model; enabling technology: Boolean operations