Assertion: abelian group's element | /r/HasProperty | 180-degree rotation
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Source sentences:
text: It can be described as the symmetry group of a non-square rectangle (with the three non-identity elements being horizontal and vertical reflection and 180-degree rotation), as the group of bitwise exclusive or operations on two-bit binary values, or more abstractly as Z 2 × Z 2 , the direct product of two copies of the cyclic group of order 2.