---

def fragment():
    fill_cell()
    move_down()
    fill_cell()
    move_left()
    fill_cell()
    move_up()
    fill_cell()
    move_down()
    move_left()
    fill_cell()
    move_left()
    fill_cell()
    move_left()
    fill_cell()
    move_up()

for i in range(3):
    fragment()
fill_cell()