7399
Pores generated by fused-filament fabrication ( FFF ) are characterized , charged , and the resultant piezoelectret activity measured .
 machanical property: Pores; manufacturing process: fused-filament fabrication; manufacturing process: FFF; concept or principle: piezoelectret
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: Pores, fused-filament fabrication, FFF, piezoelectret 
Answer:
 machanical property: Pores; manufacturing process: fused-filament fabrication; manufacturing process: FFF; concept or principle: piezoelectret