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The XFEM is able to model crack propagations in 3D printed materials without knowing a priori the crack path .
 concept or principle: model; concept or principle: crack propagations; manufacturing process: 3D printed
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: model, crack propagations, 3D printed 
Answer:
 concept or principle: model; concept or principle: crack propagations; manufacturing process: 3D printed