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By observing the surface of the built parts and classifying them into two classes ( good or bad ) , this method enables a process map to be constructed in order to predict a process condition that is effective at fabricating a part with low pore density .
 concept or principle: surface; concept or principle: process; material: be; concept or principle: process; manufacturing process: fabricating; machanical property: pore density
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: surface, process, be, process, fabricating, pore density 
Answer:
 concept or principle: surface; concept or principle: process; material: be; concept or principle: process; manufacturing process: fabricating; machanical property: pore density