In clock 12 arithmetic under the operation of addition, since the system is closed, there is an identity element, each element has an inverse, and the associative and commutative properties hold, the mathematical system is a(n) _________ group.

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Chapter 9.2, Problem 7E

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To fill: In clock 12 arithmetic under the operation of addition, since the system is closed, there is an identity element, each element has an inverse, and the associative and commutative properties hold, the mathematical system is a(n) _________ group.

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