‘forward’ and ‘rotate’, JavaMAL microworld designed in [3] can make a 3D
and ‘R’ and ‘L’ are
symbols for a turtle to change its direction to right and left respectively. In addition, ‘u’ and ‘d’ are
symbols for a turtle to make a cube by lifting on floor up and down as if a turtle is in an elevator.
The left-side image in Figure 4 is a polycube constructed by the symbols of ‘ssRsusLssd