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Finally , the fabricated hollow object was finished by milling to obtain a uniform wall thickness without any defects .
 concept or principle: fabricated; manufacturing process: milling; engineering feature: wall thickness; concept or principle: defects
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: fabricated, milling, wall thickness, defects 
Answer:
 concept or principle: fabricated; manufacturing process: milling; engineering feature: wall thickness; concept or principle: defects