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― Configuration code: RUmDmLmRLvUmDm
- Start from configuration
oriented such that the upper-right-front tile is
of type backslash.
- Rotate the upper-right-front tile around its right vertical side (together with
its lower neighbour) against the upper-right lateral tile.
It becomes a flap, to be lowered in horizontal position.
-
That flap is the internal horizontal tile of the final configuration, moving it
into position will free another flap that becomes the external horizontal tile.
