6755
Microrobotic prototypes for water cleaning are produced combining stereolithography 3D printing and wet metallization .
 concept or principle: prototypes; manufacturing process: cleaning; manufacturing process: stereolithography 3D printing; manufacturing process: metallization
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: prototypes, cleaning, stereolithography 3D printing, metallization 
Answer:
 concept or principle: prototypes; manufacturing process: cleaning; manufacturing process: stereolithography 3D printing; manufacturing process: metallization