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Thus , EDS , TKD and X-ray crystallography were performed right on this interface and revealed three main structures : a hexagonal matrix , a cubic structure and an ordered hexagonal one .
 EDS, X-ray, crystallography, interface, hexagonal, cubic structure, hexagonal
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 EDS, X-ray, crystallography, interface, hexagonal, cubic structure, hexagonal