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Symmetries: Planar + axial + central symmetries (Dihedral D2, order 4)

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Two configurations for this shape (click on the image for building instructions):
1: [no flaps, twin: 2, code: RRmUmLmDUmLmDm]
2: [no flaps, twin: 1, code: RRmDmLmUDmLmUm] [MP - 18/10/2014] periscope

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