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Symmetries: 
   Axially symmetric, chiral
Two configurations for this shape 
(click on the image for building instructions):
1: 
 [chiral, no flaps, twin: 2, code: RRUmRDmUmRDm] sleeve
2: 
 [chiral, no flaps, twin: 1, code: RRUvRDvUvRDv] sleeve