2423
Recently , a new class of preceramic photopolymers has been developed that enables additive manufacturing of ceramics using commercially available stereolithography systems .
 material: photopolymers; manufacturing process: additive manufacturing; material: ceramics; manufacturing process: stereolithography
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: photopolymers, additive manufacturing, ceramics, stereolithography 
Answer:
 material: photopolymers; manufacturing process: additive manufacturing; material: ceramics; manufacturing process: stereolithography