procedure 0
  forward 4
  left 90
  forward 2
  left 90
  forward 4
  left 90
  forward 2
  left 90
  forward 4
  left 90
  forward 2
  left 90
  forward 4
  fill red
  right 90
  forward 2
  right 90
  forward 4
  right 90
  forward 2
  right 180
  fill white
  forward 4
  left 90
  forward 4
  left 90
  forward 2
  fill green
  forward 4
  left 90
#display: x=94, y=59, grid=32