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Symmetries:
Centrally symmetric
Two configurations for this shape
(click on the image for building instructions):
1: 
[no flaps, twin: 2, code: RRmUmRvDUmLmUv]
2: 
[no flaps, twin: 1, code: RRmDmRvUDmLmDv] [MP 30/9/2014]
