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The theory of finite rings is more complex than that of finite abelian groups , since any finite abelian group is the additive group of at least two nonisomorphic finite rings : the direct product of copies of \ mathbb / m \ mathbb , and the zero ring .
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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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