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This study was designed to better understand the additive-manufactured and solution-treated microstructures as well as developing a nitride and a diffusion layer .
 engineering feature: designed; material: microstructures; material: as; material: as; material: nitride; concept or principle: diffusion
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: designed, microstructures, as, as, nitride, diffusion 
Answer:
 engineering feature: designed; material: microstructures; material: as; material: as; material: nitride; concept or principle: diffusion