• Start from M_RRmRmRRmRvLmRv
• Close it into a flat 3x1 sequence of stacked tiles: two in the northern position, four in the central position, including the two flaps (hinged about their north side), two in the southern position
• Open in 3D by hinging the central and southern tiles about a vertical (west or east) side, the northern tiles about the north side.