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In this work , new aspects of the optimization of the selective laser melting process are investigated for AM Ti-6Al-4V .
 concept or principle: optimization; manufacturing process: selective laser melting process; manufacturing process: AM
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: optimization, selective laser melting process, AM 
Answer:
 concept or principle: optimization; manufacturing process: selective laser melting process; manufacturing process: AM