def turn_right():
    repeat(turn_left, 3)

# To move up the hurdle, move
# until the right is clear (as
# long as the right is not clear).
def up_hurdle():
    turn_left()
    while not right_is_clear():
        move()
    turn_right()

# To move down the hurdle, move
# as long as the front is clear.
def down_hurdle():
    turn_right()
    while front_is_clear():
        move()
    turn_left()

# Making one step forward either
# means just moving forward or
# going up a hurdle, then moving 
# over and then moving down the
# hurdle.
def one_step():
    if front_is_clear():
        move()
    else:
        up_hurdle()
        move()
        down_hurdle()

# Make one step forward 9 times.
repeat(one_step, 9)
turn_off()