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An Octagonal Prism sold with one side rotated 90 degrees in a cylinder case like some cubes during the cube craze.
Its package has english and japanese texts.
The english reads: "With it anybody, whether a child or a mathematician will be absorbed in playing the riddles. An epoch-making brain exerciser!"
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Thank you to the following people for their assistance in helping collect the information on this page: Gabe.
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