880
Here we show that ultrasonic cavitation abrasive finishing ( UCAF ) could improve the surface integrity of PBF surfaces built at various orientations –0° , 45° and 90° .
 concept or principle: cavitation; material: abrasive; engineering feature: surface integrity; manufacturing process: PBF; concept or principle: orientations
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: cavitation, abrasive, surface integrity, PBF, orientations 
Answer:
 concept or principle: cavitation; material: abrasive; engineering feature: surface integrity; manufacturing process: PBF; concept or principle: orientations