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The rough surface scanned is what ’ s typically left by the additive manufacturing process , and has been left so in order to prove the efficacy of the NDT inspection in real conditions .
 concept or principle: surface; material: s; manufacturing process: additive manufacturing process; concept or principle: NDT; process characterization: inspection
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: surface; material: s; manufacturing process: additive manufacturing process; concept or principle: NDT; process characterization: inspection