2020
In other words , the lattice is not simply cut off on the edge of the part but unit cells are stretched to fit the surface topology .
 concept or principle: lattice; concept or principle: unit cells; concept or principle: fit; engineering feature: surface topology
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: lattice; concept or principle: unit cells; concept or principle: fit; engineering feature: surface topology