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Symmetries:
Mirror symmetric
Four configurations for this shape
(click on the image for building instructions):
1: 
[no flaps, twin: 3, code: RRmUmRDRUmRm]
2: 
[no flaps, twin: 4, code: RRmUmRvDRvUmRm]
3: 
[no flaps, twin: 1, code: RRmDmRURDmRm]
4: 
[no flaps, twin: 2, code: RRmDmRvURvDmRm]
