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The data and images obtained from experiments are employed to investigate the failure mechanism of 3D-printed specimens and demonstrate the relationship that exists between structural variations and fracture mechanical properties .
 concept or principle: data; concept or principle: images; machanical property: failure mechanism; manufacturing process: 3D-printed; concept or principle: variations; concept or principle: fracture; concept or principle: properties
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: data, images, failure mechanism, 3D-printed, variations, fracture, properties 
Answer:
 concept or principle: data; concept or principle: images; machanical property: failure mechanism; manufacturing process: 3D-printed; concept or principle: variations; concept or principle: fracture; concept or principle: properties