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The modeling method in AEM adopts the concept of discrete cracking allowing it to automatically track structural collapse behavior passing through all stages of loading : elastic , crack initiation and propagation in tension-weak materials , reinforcement yield , element separation , element contact and collision , as well as collision with the ground and adjacent structures .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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