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 a wavy 
# line: four waves, one after
# the other. I added a final
# step over to make it look
# more symmetrical.

draw_wave()
draw_wave()
draw_wave()
draw_wave()
move()

turn_off()