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The notch strength of this 3D-printed material was investigated by testing a large number of specimens , with the experiments being run not only under tension , but also under three-point bending .
 engineering feature: notch; manufacturing process: 3D-printed; process characterization: testing; process characterization: three-point bending
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: notch, 3D-printed, testing, three-point bending 
Answer:
 engineering feature: notch; manufacturing process: 3D-printed; process characterization: testing; process characterization: three-point bending