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Symmetries:
Mirror symmetric
Four configurations for this shape
(click on the image for building instructions):
1: 
[two flaps, twin: 2, code: RRmURmRLvULv]
2: 
[two flaps, twin: 1, code: RRmDRmRLvDLv]
3: 
[two flaps, twin: 4, code: RUmUvDmRDmUvUm]
4: 
[two flaps, twin: 3, code: RUmDvDmRDmDvUm]
