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For the final optimization of geometry so that it combines AM benefits with efficient production and inspection , a lot of research has been conducted .
 concept or principle: optimization; concept or principle: geometry; manufacturing process: AM; manufacturing process: production; process characterization: inspection; concept or principle: research
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: optimization; concept or principle: geometry; manufacturing process: AM; manufacturing process: production; process characterization: inspection; concept or principle: research