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