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Points of the boundary and internal elements are subsequently separated , and the initial wireframe is mapped onto the boundary kernel points , followed by a trimming procedure used to remove wires outside the functional volume .
 engineering feature: boundary; material: elements; concept or principle: boundary kernel points; manufacturing process: trimming; concept or principle: volume
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: boundary; material: elements; concept or principle: boundary kernel points; manufacturing process: trimming; concept or principle: volume