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Double Edge Turning Symmetry (Octagonal Edges Extended 21E0800104C84)
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A 3x3x3 truncated on 6 edges and afterwards extended. The shape has a very rare symmetry.

This puzzle is part of the series "Octgonal Edges". All modifications of this series are made by truncating an 3x3x3 on its edges. These truncations are symmetric as in the mass produced octagon from which the series takes its name.
The technical signature (Octagonal Edges Extended 21E0800104C84) indicates where to cut the original cube.
Without the keyword "Extended" it is a variant made only by truncating the original cube. With the word "Extended" some sides left over from the original receive additional extensions to "delete" some of these remaining faces.
The non-extended variant is shown in image 4
This variant has a very rare symmetry. With respect to the unmodified cube in the puzzle it can be turned by 180 along two edges and one face.
Edge length: 35 x 101 mm (rectangular face)
Edge length: 68 mm (trapezoidal face)
Weight: 213 grams



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This puzzle can be found in collections of these members:

Andreas Nortmann: Andreas' collection

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