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In this work , a Cellular Automata ( CA ) based two-dimensional microstructure model is formulated and implemented to understand grain evolution in AM .
 CA, two-dimensional microstructure, model, grain evolution, 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:
 CA, two-dimensional microstructure, model, grain evolution, AM