• Start from RRmRvURRvRmU
• Close into a 2x2 square with stacks of three tiles in positions North-West and South-East, a single tile at first floor in position North-East and a single tile at third floor in position South-West of type slash
• Open in 3D with the following hingings
  • Both south sides for the South-East stack (giving rise to a flap)
  • West and East sides for the North-West stack
• Obtain the required shape