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

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Four configurations for this shape (click on the image for building instructions):
1: [no flaps, twin: 2, code: RRmRmUmLUmRmRm]
2: [no flaps, twin: 1, code: RRmRmDmLDmRmRm]
3: [no flaps, twin: 4, code: RRmUmLmDLmUmRm]
4: [no flaps, twin: 3, code: RRmDmLmULmDmRm]

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