def turn_right():
    turn_left()
    turn_left()
    turn_left()

# This function draws one wave:
# over, up, over, down (note:
# no step "over" in the end)
def draw_wave():
    move()
    turn_left()
    move()
    turn_right()
    move()
    turn_right()
    move()
    turn_left()

# This program draws 9 waves in
# a row. It uses a loop to do 
# so.

repeat(draw_wave, 9)
move()

turn_off()