8892
Thus , tensile test bars and complex porous gyroid specimens were successfully manufactured via PBF without the need for any additional surface functionalization of the particles with flow agents .
 process characterization: tensile test; machanical property: porous; concept or principle: manufactured; manufacturing process: PBF; concept or principle: surface; concept or principle: particles
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: tensile test, porous, manufactured, PBF, surface, particles 
Answer:
 process characterization: tensile test; machanical property: porous; concept or principle: manufactured; manufacturing process: PBF; concept or principle: surface; concept or principle: particles