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In addition , the micro-structure of the EBM sample is found free of preferential orientation , whereas in the SLM sample significant preference towards the hexagonal basal plane is found .
 EBM, orientation, SLM, sample, hexagonal, basal plane
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:
 EBM, orientation, SLM, sample, hexagonal, basal plane