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A photopolymer extrusion 3D printing technique , which combines the strengths of FDM and UV assisted 3D printing technology is demonstrated in this paper .
 material: photopolymer; manufacturing process: extrusion; manufacturing process: 3D printing; machanical property: strengths; manufacturing process: FDM; concept or principle: UV; enabling technology: 3D printing technology
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: photopolymer, extrusion, 3D printing, strengths, FDM, UV, 3D printing technology 
Answer:
 material: photopolymer; manufacturing process: extrusion; manufacturing process: 3D printing; machanical property: strengths; manufacturing process: FDM; concept or principle: UV; enabling technology: 3D printing technology