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Symmetries:
Symmetries of a square prism (D4h, order 16)
Three configurations for this shape
(click on the image for building instructions):
1: [no flaps, self-twin, code: RUmRDmRUmRDm]
2: [no flaps, twin: 3, code: RUmDmUmRUmDmUm]
3: [no flaps, twin: 2, code: RUvDvUvRUvDvUv]