18-600f19-th.jpg
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18-600f19-th.jpg
Alt text:
A big Rubik's cube on the street.
Caption:
In the popular puzzle Rubik’s Cube invented in 1974 by Ernő Rubik, each turn of the puzzle faces creates a permutation of the surface colors. (Image by Kristin on flickr. License CC BY-NC-SA.)
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