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The columnar to equiaxed transition ( CET ) of grain structures associated with processing conditions has been observed during metallic additive manufacturing ( AM ) .
 transition, grain structures, metallic additive manufacturing, AM
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:
 transition, grain structures, metallic additive manufacturing, AM